Power & current measurment | Forum for Electronics

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It may not display this or other websites correctly.<br />You should upgrade or use an <a href="https://www.google.com/chrome/" target="_blank" rel="noopener">alternative browser</a>.</div> <div class="p-body-header"> <div class="p-title "> <h1 class="p-title-value">Power & current measurment</h1> </div> <div class="p-description"> <ul class="listInline listInline--bullet"> <li> <i class="fa--xf fal fa-user" aria-hidden="true" title="Thread starter"></i> <span class="u-srOnly">Thread starter</span> <a href="/members/saati.678261/" class="username u-concealed" dir="auto" data-user-id="678261" data-xf-init="member-tooltip">Saati</a> </li> <li> <i class="fa--xf fal fa-clock" aria-hidden="true" title="Start date"></i> <span class="u-srOnly">Start date</span> <a href="/threads/power-current-measurment.413116/" class="u-concealed"><time class="u-dt" dir="auto" datetime="2024-11-23T06:51:39+0000" data-time="1732344699" data-date-string="Nov 23, 2024" data-time-string="6:51 AM" title="Nov 23, 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class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/power-current-measurment.413116/post-1784431" rel="nofollow" > <time class="u-dt" dir="auto" datetime="2024-11-23T06:51:39+0000" data-time="1732344699" data-date-string="Nov 23, 2024" data-time-string="6:51 AM" title="Nov 23, 2024 at 6:51 AM">Today at 6:51 AM</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/power-current-measurment.413116/post-1784431" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1784431/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/power-current-measurment.413116/post-1784431" rel="nofollow"> #1 </a> </li> </ul> </header> </div> <div class="message-inner"> <div class="message-cell message-cell--user"> <section class="message-user" > <div class="message-avatar "> <div class="message-avatar-wrapper"> <a href="/members/saati.678261/" class="avatar avatar--m avatar--default avatar--default--dynamic" data-user-id="678261" data-xf-init="member-tooltip" style="background-color: #1f7a5c; color: #70dbb8"> <span class="avatar-u678261-m" role="img" aria-label="Saati">S</span> </a> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/saati.678261/" class="username " dir="auto" data-user-id="678261" data-xf-init="member-tooltip">Saati</a></h4> <h5 class="userTitle message-userTitle" dir="auto">Newbie level 4</h5> </div> <img src="/styles/images/ranks/blevel1.gif" alt="Newbie level 4"> <div class="message-userExtras"> <dl class="pairs pairs--justified joinedBlock"> <dt>Joined</dt> <dd>Apr 14, 2023</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed"> <dt>Messages</dt> <dd>7</dd> </dl> <dl class="pairs pairs--justified"> <dt> Helped</dt> <dd>0</dd> </dl> <dl class="pairs pairs--justified"> <dt>Reputation </dt> <dd> <a 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microcontroller.<br /> <br /> I series a 0.1ohm resistor with power supply (VDD) and then saw the drop voltage of the resistor by an oscilloscope with 200MHz bandwidth. but the spike of current is not good and I can't measure the peak of current in each rising edge of the clock.<br /> <br /> Can anybody help me and introduce the methodology of companies for characterizing the power per clock and current peak in the rising edge of the clock?<br /> <br /> Thanks & Regards<br /> Saati</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> </div> <footer class="message-footer"> <div class="message-actionBar actionBar"> <div class="actionBar-set actionBar-set--external"> <a href="/threads/power-current-measurment.413116/reply?quote=1784431" class="actionBar-action actionBar-action--reply" title="Reply, quoting this message" rel="nofollow" data-xf-click="quote" data-quote-href="/posts/1784431/quote">Reply</a> </div> </div> <div class="reactionsBar js-reactionsList "> </div> 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js-inlineModContainer " data-author="KlausST" data-content="post-1784439" id="js-post-1784439" itemscope itemtype="https://schema.org/Answer" itemid="https://www.edaboard.com/posts/1784439/"> <meta itemprop="parentItem" itemscope itemid="https://www.edaboard.com/threads/power-current-measurment.413116/" /> <span class="u-anchorTarget" id="post-1784439"></span> <div class="message-header"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/power-current-measurment.413116/post-1784439" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-11-23T08:23:55+0000" data-time="1732350235" data-date-string="Nov 23, 2024" data-time-string="8:23 AM" title="Nov 23, 2024 at 8:23 AM" itemprop="datePublished">Today at 8:23 AM</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/power-current-measurment.413116/post-1784439" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1784439/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/power-current-measurment.413116/post-1784439" rel="nofollow"> #2 </a> </li> </ul> </header> </div> <div class="message-inner"> <div class="message-cell message-cell--user"> <section class="message-user" itemprop="author" itemscope itemtype="https://schema.org/Person" itemid="https://www.edaboard.com/members/klausst.544298/"> <meta itemprop="url" content="https://www.edaboard.com/members/klausst.544298/" /> <div class="message-avatar "> <div class="message-avatar-wrapper"> <a href="/members/klausst.544298/" class="avatar avatar--m" data-user-id="544298" data-xf-init="member-tooltip"> <img src="/data/avatars/m/544/544298.jpg?1591959018" srcset="/data/avatars/l/544/544298.jpg?1591959018 2x" alt="KlausST" class="avatar-u544298-m" width="96" height="96" loading="lazy" itemprop="image" /> </a> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/klausst.544298/" class="username " dir="auto" data-user-id="544298" data-xf-init="member-tooltip"><span itemprop="name">KlausST</span></a></h4> <h5 class="userTitle message-userTitle" dir="auto" itemprop="jobTitle">Advanced Member level 7</h5> </div> <img src="/styles/images/ranks/hlevel4.gif" alt="Advanced Member level 7"> <div class="message-userExtras"> <dl class="pairs pairs--justified joinedBlock"> <dt>Joined</dt> <dd>Apr 17, 2014</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed"> <dt>Messages</dt> <dd>26,150</dd> </dl> <dl class="pairs pairs--justified"> <dt> Helped</dt> <dd>4,921</dd> </dl> <dl class="pairs pairs--justified"> <dt>Reputation </dt> <dd> <a href="/reputation/authors/klausst.544298" class="fauxBlockLink-linkRow u-concealed">9,867</a> </dd> </dl> <dl class="pairs 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(no resitor between capacitor and IC)<br /> <br /> Thus I expect frequencies in the kHz region max. .. with low voltage ripple.<br /> <br /> Klaus</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> </div> <footer class="message-footer"> <div class="message-microdata" itemprop="interactionStatistic" itemtype="https://schema.org/InteractionCounter" itemscope> <meta itemprop="userInteractionCount" content="0" /> <meta itemprop="interactionType" content="https://schema.org/LikeAction" /> </div> <div class="message-actionBar actionBar"> <div class="actionBar-set actionBar-set--external"> <a href="/threads/power-current-measurment.413116/reply?quote=1784439" class="actionBar-action actionBar-action--reply" title="Reply, quoting this message" rel="nofollow" data-xf-click="quote" data-quote-href="/posts/1784439/quote">Reply</a> </div> </div> <div class="reactionsBar js-reactionsList "> </div> <br/> <div class="js-historyTarget message-historyTarget toggleTarget" data-href="trigger-href"></div> </footer> </div> </div> <div class="message-cell message-cell--vote"> <div class="message-column"> <div class="contentVote js-contentVote " data-xf-init="content-vote" data-content-id="post-1784439"> <meta itemprop="upvoteCount" content="0" /> <a href="javascript:" class="contentVote-vote is-disabled contentVote-vote--up " data-vote="up"><span class="u-srOnly">Upvote</span></a> <span class="contentVote-score js-voteCount" data-score="0">0</span> <a href="javascript:" class="contentVote-vote is-disabled contentVote-vote--down " data-vote="down"><span class="u-srOnly">Downvote</span></a> </div> </div> </div> </div> </article> <article class="message message--post js-post js-inlineModContainer " data-author="Saati" data-content="post-1784453" id="js-post-1784453" itemscope itemtype="https://schema.org/Answer" itemid="https://www.edaboard.com/posts/1784453/"> <meta itemprop="parentItem" itemscope itemid="https://www.edaboard.com/threads/power-current-measurment.413116/" /> <span class="u-anchorTarget" id="post-1784453"></span> <div class="message-header"> <header class="message-attribution message-attribution--split"> <ul class="message-attribution-main listInline "> <li class="u-concealed"> <a href="/threads/power-current-measurment.413116/post-1784453" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2024-11-23T09:44:58+0000" data-time="1732355098" data-date-string="Nov 23, 2024" data-time-string="9:44 AM" title="Nov 23, 2024 at 9:44 AM" itemprop="datePublished">Today at 9:44 AM</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/power-current-measurment.413116/post-1784453" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/1784453/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/power-current-measurment.413116/post-1784453" rel="nofollow"> #3 </a> </li> </ul> </header> </div> <div class="message-inner"> <div class="message-cell message-cell--user"> <section class="message-user" itemprop="author" itemscope itemtype="https://schema.org/Person" itemid="https://www.edaboard.com/members/saati.678261/"> <meta itemprop="url" content="https://www.edaboard.com/members/saati.678261/" /> <div class="message-avatar "> <div class="message-avatar-wrapper"> <a href="/members/saati.678261/" class="avatar avatar--m avatar--default avatar--default--dynamic" data-user-id="678261" data-xf-init="member-tooltip" style="background-color: #1f7a5c; color: #70dbb8"> <span class="avatar-u678261-m" role="img" aria-label="Saati">S</span> </a> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/saati.678261/" class="username " dir="auto" data-user-id="678261" data-xf-init="member-tooltip"><span itemprop="name">Saati</span></a></h4> <h5 class="userTitle message-userTitle" dir="auto" itemprop="jobTitle">Newbie level 4</h5> </div> <img src="/styles/images/ranks/blevel1.gif" alt="Newbie level 4"> <div class="message-userExtras"> <dl class="pairs pairs--justified joinedBlock"> <dt>Joined</dt> <dd>Apr 14, 2023</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed"> <dt>Messages</dt> <dd>7</dd> </dl> <dl class="pairs pairs--justified"> <dt> Helped</dt> <dd>0</dd> </dl> <dl class="pairs pairs--justified"> <dt>Reputation </dt> <dd> <a href="/reputation/authors/saati.678261" class="fauxBlockLink-linkRow u-concealed">0</a> </dd> </dl> <dl class="pairs pairs--justified"> <dt>Reaction score</dt> <dd>0</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed trophyBlock"> <dt>Trophy points</dt> <dd>1</dd> </dl> <dl class="pairs pairs--justified creditBlock"> <dt title="Activity points">Activity points</dt> <dd> <a href="/activity/" data-xf-click="overlay" class="fauxBlockLink-blockLink u-concealed"> 48 </a> </dd> </dl> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1784453" data-lb-caption-desc="Saati · Nov 23, 2024 at 9:44 AM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper"><blockquote data-attributes="member: 544298" data-quote="KlausST" data-source="post: 1784439" class="bbCodeBlock bbCodeBlock--expandable bbCodeBlock--quote js-expandWatch"> <div class="bbCodeBlock-title"> <a href="/goto/post?id=1784439" class="bbCodeBlock-sourceJump" rel="nofollow" data-xf-click="attribution" data-content-selector="#post-1784439">KlausST said:</a> </div> <div class="bbCodeBlock-content"> <div class="bbCodeBlock-expandContent js-expandContent "> Hi,<br /> <br /> Spike on the resistor ... should not be, since it is mandatory to put fast capacitors at the VCC pin(s) of the microcontroller. (no resitor between capacitor and IC)<br /> <br /> Thus I expect frequencies in the kHz region max. .. with low voltage ripple.<br /> <br /> Klaus </div> <div class="bbCodeBlock-expandLink js-expandLink"><a role="button" tabindex="0">Click to expand...</a></div> </div> </blockquote>Thanks for your reply.<br /> Based on dynamic simulation in Innovus the peak of current is about 1.6ampers.<br /> I want to measure this current and report it in a datasheet.<br /> <br /> I do not have any capacitor near the IC that can measure the current peak.<br /> <br /> Do you have any recommendations for an approach to measuring the spike current?<br /> <br /> Thanks & Regards<br /> Saati</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> <div class="message-lastEdit"> Last edited: <time class="u-dt" dir="auto" datetime="2024-11-23T09:54:18+0000" data-time="1732355658" data-date-string="Nov 23, 2024" data-time-string="9:54 AM" title="Nov 23, 2024 at 9:54 AM" 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<div class="message-main js-quickEditTarget"> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1784458" data-lb-caption-desc="danadakk · Nov 23, 2024 at 12:56 PM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper">Use infinite persistence mode on scope to get to peak values. If you<br /> have color grading (frequency of sample occurrence) maybe turn that<br /> on to get additional information on spike.<br /> <br /> <div class="bbCodeBlock bbCodeBlock--unfurl js-unfurl fauxBlockLink" data-unfurl="true" data-result-id="214903" data-url="https://www.picotech.com/library/knowledge-bases/oscilloscopes/digital-persistence-modes" data-host="www.picotech.com" data-pending="false"> <div class="contentRow"> <div class="contentRow-figure contentRow-figure--fixedSmall js-unfurl-figure"> <img src="https://www.picotech.com/library/wp-content/uploads/2024/07/PS7_persistence_config_light.webp" alt="www.picotech.com" data-onerror="hide-parent"/> </div> <div class="contentRow-main"> <h3 class="contentRow-header js-unfurl-title"> <a href="https://www.picotech.com/library/knowledge-bases/oscilloscopes/digital-persistence-modes" class="link link--external fauxBlockLink-blockLink" target="_blank" rel="nofollow ugc noopener" data-proxy-href=""> Digital oscilloscope persistence modes </a> </h3> <div class="contentRow-snippet js-unfurl-desc">Advanced oscilloscope display modes collect thousands of waveforms per second. New or more frequent data is displayed in a brighter color or shade.</div> <div class="contentRow-minor contentRow-minor--hideLinks"> <span class="js-unfurl-favicon"> <img src="https://www.picotech.com/library/wp-content/uploads/2024/04/favicon-112px.jpg" alt="www.picotech.com" class="bbCodeBlockUnfurl-icon" data-onerror="hide-parent"/> </span> www.picotech.com </div> </div> </div> </div> <br /> Another simple method, but takes longer to evaluate, is simple set scope for<br /> level trigger mode, and keep advancing level until no more triggers occur.<br /> But infinite persistence I think better method.<br /> <br /> The value of infinite persistence, set your scope on AC, say 100 mV/box, infinite<br /> persistence, and look at your supply rail. Usually an eye opener, eg. the pk-pk<br /> noise levels on micro supply rails.<br /> <br /> Make sure scope acquisition mode is at highest sampling rate, but<br /> thats affected by spike rep rate.<br /> <br /> Also use scope FFT to get a better idea of source of spike, eg. more detective<br /> work.<br /> <br /> <br /> Regards, Dana.</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> <div class="message-lastEdit"> Last edited: <time class="u-dt" dir="auto" datetime="2024-11-23T13:11:37+0000" data-time="1732367497" data-date-string="Nov 23, 2024" data-time-string="1:11 PM" title="Nov 23, 2024 at 1:11 PM" itemprop="dateModified">Today at 1:11 PM</time> </div> </div> <footer class="message-footer"> <div class="message-microdata" itemprop="interactionStatistic" itemtype="https://schema.org/InteractionCounter" itemscope> <meta itemprop="userInteractionCount" content="0" /> <meta itemprop="interactionType" content="https://schema.org/LikeAction" /> </div> <div 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class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1784459" data-lb-caption-desc="Saati · Nov 23, 2024 at 1:01 PM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper"><blockquote data-attributes="member: 604253" data-quote="danadakk" data-source="post: 1784458" class="bbCodeBlock bbCodeBlock--expandable bbCodeBlock--quote js-expandWatch"> <div class="bbCodeBlock-title"> <a href="/goto/post?id=1784458" class="bbCodeBlock-sourceJump" rel="nofollow" data-xf-click="attribution" data-content-selector="#post-1784458">danadakk said:</a> </div> <div class="bbCodeBlock-content"> <div class="bbCodeBlock-expandContent js-expandContent "> Use infinite persistence mode on scope to get get to peak values.<br /> <br /> Make sure scope acquisition mode is at highest sampling rate, but<br /> thats affected by spike rep rate.<br /> <br /> <br /> Regards, Dana. </div> <div class="bbCodeBlock-expandLink js-expandLink"><a role="button" tabindex="0">Click to expand...</a></div> </div> </blockquote>Thanks danadakk.<br /> <br /> The bandwidth of the oscilloscope and probe is not affect the result ?<br /> <br /> I need the wideband oscilloscope?</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> </div> <footer class="message-footer"> <div class="message-microdata" itemprop="interactionStatistic" itemtype="https://schema.org/InteractionCounter" itemscope> <meta itemprop="userInteractionCount" content="0" /> <meta itemprop="interactionType" content="https://schema.org/LikeAction" /> </div> <div class="message-actionBar actionBar"> <div class="actionBar-set actionBar-set--external"> <a href="/threads/power-current-measurment.413116/reply?quote=1784459" class="actionBar-action actionBar-action--reply" title="Reply, quoting this message" rel="nofollow" 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data-lb-id="post-1784461" data-lb-caption-desc="FvM · Nov 23, 2024 at 2:24 PM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper">100 MHz bandwidth current measurement with a low-ohmic (e.g. 100 mOhm) shunt needs exact compensation of resistor inductance, calibrated with a VNA or similar tool.</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> </div> <footer class="message-footer"> <div class="message-microdata" itemprop="interactionStatistic" itemtype="https://schema.org/InteractionCounter" itemscope> <meta itemprop="userInteractionCount" content="0" /> <meta itemprop="interactionType" content="https://schema.org/LikeAction" /> </div> <div class="message-actionBar actionBar"> <div class="actionBar-set actionBar-set--external"> <a href="/threads/power-current-measurment.413116/reply?quote=1784461" class="actionBar-action actionBar-action--reply" title="Reply, quoting this message" rel="nofollow" data-xf-click="quote" 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class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper"><blockquote data-attributes="member: 152255" data-quote="FvM" data-source="post: 1784461" class="bbCodeBlock bbCodeBlock--expandable bbCodeBlock--quote js-expandWatch"> <div class="bbCodeBlock-title"> <a href="/goto/post?id=1784461" class="bbCodeBlock-sourceJump" rel="nofollow" data-xf-click="attribution" data-content-selector="#post-1784461">FvM said:</a> </div> <div class="bbCodeBlock-content"> <div class="bbCodeBlock-expandContent js-expandContent "> 100 MHz bandwidth current measurement with a low-ohmic (e.g. 100 mOhm) shunt needs exact compensation of resistor inductance, calibrated with a VNA or similar tool. </div> <div class="bbCodeBlock-expandLink js-expandLink"><a role="button" tabindex="0">Click to expand...</a></div> </div> </blockquote>Thanks for your good guidance.<br /> <br /> Can you explain more ?<br /> <br /> The famous companies (e.g. STM, TI) how measure the peak current at rising edge of clock?<br /> <br /> Thanks & Regards<br /> Saati</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> </div> <footer class="message-footer"> <div class="message-microdata" itemprop="interactionStatistic" itemtype="https://schema.org/InteractionCounter" itemscope> <meta itemprop="userInteractionCount" content="0" /> <meta itemprop="interactionType" content="https://schema.org/LikeAction" /> </div> <div class="message-actionBar actionBar"> <div class="actionBar-set actionBar-set--external"> <a href="/threads/power-current-measurment.413116/reply?quote=1784462" class="actionBar-action actionBar-action--reply" title="Reply, quoting this message" rel="nofollow" data-xf-click="quote" data-quote-href="/posts/1784462/quote">Reply</a> </div> </div> <div class="reactionsBar js-reactionsList "> </div> <br/> <div class="js-historyTarget message-historyTarget toggleTarget" data-href="trigger-href"></div> </footer> </div> </div> <div class="message-cell 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class="message-inner"> <div class="message-cell message-cell--user"> <section class="message-user" itemprop="author" itemscope itemtype="https://schema.org/Person" itemid="https://www.edaboard.com/members/fvm.152255/"> <meta itemprop="url" content="https://www.edaboard.com/members/fvm.152255/" /> <div class="message-avatar "> <div class="message-avatar-wrapper"> <a href="/members/fvm.152255/" class="avatar avatar--m" data-user-id="152255" data-xf-init="member-tooltip"> <img src="/data/avatars/m/152/152255.jpg?1591449713" srcset="/data/avatars/l/152/152255.jpg?1591449713 2x" alt="FvM" class="avatar-u152255-m" width="96" height="96" loading="lazy" itemprop="image" /> </a> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/fvm.152255/" class="username " dir="auto" data-user-id="152255" data-xf-init="member-tooltip"><span class="username--staff username--moderator" itemprop="name">FvM</span></a></h4> <h5 class="userTitle message-userTitle" dir="auto" 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pairs--justified locationBlock"> <dt>Location</dt> <dd> <a href="/misc/location-info?location=Bochum%2C+Germany" rel="nofollow noreferrer" target="_blank" class="u-concealed">Bochum, Germany</a> </dd> </dl> <dl class="pairs pairs--justified creditBlock"> <dt title="Activity points">Activity points</dt> <dd> <a href="/activity/" data-xf-click="overlay" class="fauxBlockLink-blockLink u-concealed"> 301,129 </a> </dd> </dl> </div> <span class="message-userArrow"></span> </section> </div> <div class="message-cell message-cell--main"> <div class="message-main js-quickEditTarget"> <div class="message-content js-messageContent"> <div class="message-userContent lbContainer js-lbContainer " data-lb-id="post-1784466" data-lb-caption-desc="FvM · Nov 23, 2024 at 3:02 PM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper">I'm not in the IC design business. I imagine that any current measurement device affects VCC current waveform. I'd probably go for miniature current transformer, hall sensor or coreless di/dt sensor (Rogowski coil).</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> </div> <footer class="message-footer"> <div class="message-microdata" itemprop="interactionStatistic" itemtype="https://schema.org/InteractionCounter" itemscope> <meta itemprop="userInteractionCount" content="0" /> <meta itemprop="interactionType" content="https://schema.org/LikeAction" /> </div> <div class="message-actionBar actionBar"> <div class="actionBar-set actionBar-set--external"> <a href="/threads/power-current-measurment.413116/reply?quote=1784466" class="actionBar-action actionBar-action--reply" title="Reply, quoting this message" rel="nofollow" data-xf-click="quote" data-quote-href="/posts/1784466/quote">Reply</a> </div> </div> <div class="reactionsBar js-reactionsList "> </div> <br/> <div class="js-historyTarget message-historyTarget toggleTarget" data-href="trigger-href"></div> </footer> </div> 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Are you sure you want to submit this form?", attach: "Attach files", rich_text_box: "Rich text box", close: "Close", link_copied_to_clipboard: "Link copied to clipboard.", text_copied_to_clipboard: "Text copied to clipboard.", loading: "Loading…", you_have_exceeded_maximum_number_of_selectable_items: "You have exceeded the maximum number of selectable items.", processing: "Processing", 'processing...': "Processing…", showing_x_of_y_items: "Showing {count} of {total} items", showing_all_items: "Showing all items", no_items_to_display: "No items to display", number_button_up: "Increase", number_button_down: "Decrease", push_enable_notification_title: "Push notifications enabled successfully at Forum for Electronics", push_enable_notification_body: "Thank you for enabling push notifications!", pull_down_to_refresh: "Pull down to refresh", release_to_refresh: "Release to refresh", refreshing: "Refreshing…" , "svStandardLib_time.day": "{count} day", "svStandardLib_time.days": "{count} days", "svStandardLib_time.hour": "{count} hour", "svStandardLib_time.hours": "{count} hours", "svStandardLib_time.minute": "{count} minutes", "svStandardLib_time.minutes": "{count} minutes", "svStandardLib_time.month": "{count} month", "svStandardLib_time.months": "{count} months", "svStandardLib_time.second": "{count} second", "svStandardLib_time.seconds": "{count} seconds", "svStandardLib_time.week": "time.week", "svStandardLib_time.weeks": "{count} weeks", "svStandardLib_time.year": "{count} year", "svStandardLib_time.years": "{count} years" }); </script> <form style="display:none" hidden="hidden"> <input type="text" name="_xfClientLoadTime" value="" id="_xfClientLoadTime" title="_xfClientLoadTime" tabindex="-1" /> </form>  <script type="application/ld+json"> { "@context": "https://schema.org", "@type": "QAPage", "url": "https://www.edaboard.com/threads/power-current-measurment.413116/", "mainEntity": { "@type": "Question", "@id": "https://www.edaboard.com/threads/power-current-measurment.413116/", "name": "Power & current measurment", "datePublished": "2024-11-23T06:51:39+00:00", "url": "https://www.edaboard.com/threads/power-current-measurment.413116/", "text": "Hi everyone.\n\nI want to measure the power and peak of the current microcontroller.\n\nI series a 0.1ohm resistor with power supply (VDD) and then saw the drop voltage of the resistor by an oscilloscope with 200MHz bandwidth. but the spike of current is not good and I can't measure the peak of current in each rising edge of the clock.\n\nCan anybody help me and introduce the methodology of companies for characterizing the power per clock and current peak in the rising edge of the clock?\n\nThanks & Regards\nSaati", "answerCount": 7, "upvoteCount": 0, "author": { "@type": "Person", "@id": "https://www.edaboard.com/members/saati.678261/", "name": "Saati", "url": "https://www.edaboard.com/members/saati.678261/" }, "suggestedAnswer": [ { "@type": "Answer", "datePublished": "2024-11-23T15:02:14+00:00", "url": "https://www.edaboard.com/posts/1784466/", "text": "I'm not in the IC design business. I imagine that any current measurement device affects VCC current waveform. I'd probably go for miniature current transformer, hall sensor or coreless di/dt sensor (Rogowski coil).", "upvoteCount": 0, "author": { "@type": "Person", "@id": "https://www.edaboard.com/members/fvm.152255/", "name": "FvM", "url": "https://www.edaboard.com/members/fvm.152255/" } }, { "@type": "Answer", "datePublished": "2024-11-23T14:32:01+00:00", "url": "https://www.edaboard.com/posts/1784462/", "text": "100 MHz bandwidth current measurement with a low-ohmic (e.g. 100 mOhm) shunt needs exact compensation of resistor inductance, calibrated with a VNA or similar tool.\n\nThanks for your good guidance.\n\nCan you explain more ?\n\nThe famous companies (e.g. STM, TI) how measure the peak current at rising edge of clock?\n\nThanks & Regards\nSaati", "upvoteCount": 0, "author": { "@type": "Person", "@id": "https://www.edaboard.com/members/saati.678261/", "name": "Saati", "url": "https://www.edaboard.com/members/saati.678261/" } }, { "@type": "Answer", "datePublished": "2024-11-23T14:24:23+00:00", "url": "https://www.edaboard.com/posts/1784461/", "text": "100 MHz bandwidth current measurement with a low-ohmic (e.g. 100 mOhm) shunt needs exact compensation of resistor inductance, calibrated with a VNA or similar tool.", "upvoteCount": 0, "author": { "@type": "Person", "@id": "https://www.edaboard.com/members/fvm.152255/", "name": "FvM", "url": "https://www.edaboard.com/members/fvm.152255/" } } ] }, "publisher": { "@type": "Organization", "name": "Forum for Electronics", "description": "International Electronics Discussion Forum: EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals", "url": "https://www.edaboard.com" } } </script> <script> $(function(){ var notice = $('.xb-welcome-notice'); if(notice.length){ var cookie = XF.Cookie.get('hide_welcome_notice'); if(!cookie){ XF.Cookie.set('hide_welcome_notice', Date.now()); notice.show(); } else if ((Date.now() - cookie) > 8.64e+7){ XF.Cookie.set('hide_welcome_notice', Date.now()); notice.show(); } else { notice.hide(); } } }); </script> </div> </body> </html>

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