Phase detectors and envelope detectors

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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">Phase detectors and envelope detectors</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/my8os.11833/" class="username u-concealed" dir="auto" data-user-id="11833" data-xf-init="member-tooltip">my8os</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/phase-detectors-and-envelope-detectors.14355/" class="u-concealed"><time class="u-dt" dir="auto" datetime="2004-01-19T14:54:34+0000" data-time="1074524074" data-date-string="Jan 19, 2004" data-time-string="2:54 PM" title="Jan 19, 2004 at 2:54 PM">Jan 19, 2004</time></a> </li> </ul> </div> </div> <div class="p-body-main p-body-main--withSidebar "> <div class="p-body-contentCol"></div> <div class="p-body-sidebarCol"></div> <div class="p-body-content">  <div id='div-gpt-eda_wallpaper'> <script> googletag.cmd.push(function() { googletag.display('div-gpt-eda_wallpaper'); }); </script> </div> <div class="p-body-pageContent"> <div class="block block--messages" data-xf-init="" data-type="post" data-href="/inline-mod/" data-search-target="*"> <span class="u-anchorTarget" id="posts"></span> <div class="block-outer"> <dl class="blockStatus"> <dt>Status</dt> <dd class="blockStatus-message blockStatus-message--locked"> Not open for further replies. </dd> </dl> </div> <div class="block-outer"></div> <div class="block-outer js-threadStatusField"></div> <div class="block-container lbContainer" data-xf-init="lightbox select-to-quote" data-message-selector=".js-post" data-lb-id="thread-14355" data-lb-universal="0"> <div class="block-body js-replyNewMessageContainer"> <article class="message message--post js-post js-inlineModContainer " data-author="my8os" data-content="post-58263" id="js-post-58263" > <span class="u-anchorTarget" id="post-58263"></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/phase-detectors-and-envelope-detectors.14355/post-58263" rel="nofollow" > <time class="u-dt" dir="auto" datetime="2004-01-19T14:54:34+0000" data-time="1074524074" data-date-string="Jan 19, 2004" data-time-string="2:54 PM" title="Jan 19, 2004 at 2:54 PM">Jan 19, 2004</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/phase-detectors-and-envelope-detectors.14355/post-58263" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/58263/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/phase-detectors-and-envelope-detectors.14355/post-58263" 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/my8os.11833/" class="avatar avatar--m avatar--default avatar--default--dynamic" data-user-id="11833" data-xf-init="member-tooltip" style="background-color: #e0a385; color: #8f4724"> <span class="avatar-u11833-m" role="img" aria-label="my8os">M</span> </a> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/my8os.11833/" class="username " dir="auto" data-user-id="11833" data-xf-init="member-tooltip">my8os</a></h4> <h5 class="userTitle message-userTitle" dir="auto">Junior Member level 3</h5> </div> <img src="/styles/images/ranks/clevel3.gif" alt="Junior Member level 3"> <div class="message-userExtras"> <dl class="pairs pairs--justified joinedBlock"> <dt>Joined</dt> <dd>Dec 15, 2003</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed"> <dt>Messages</dt> <dd>26</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/my8os.11833" 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>1,281</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"> 171 </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-58263" data-lb-caption-desc="my8os · Jan 19, 2004 at 2:54 PM"> <article class="message-body js-selectToQuote"> <div > <div class="bbWrapper"><b>envelope detectors</b><br /> <br /> I'd like to extract a QAM signal's amplitude and phase from its IF (@40MHz) signal.<br /> I figure an envelope and phase detector will do the job, however I'd like some more information on the design issues entailed. Can anyone point me to a paper or book that describes these in some detail?<br /> <br /> Also is there another way to get amplitude&phase?</div> </div> <div class="js-selectToQuoteEnd"> </div> </article> </div> </div> <footer class="message-footer"> <div class="reactionsBar js-reactionsList "> </div> <br/> <div class="js-historyTarget message-historyTarget toggleTarget" data-href="trigger-href"></div> </footer> </div> </div> </div> </article> <article class="message message--post js-post js-inlineModContainer " data-author="flatulent" data-content="post-58279" id="js-post-58279" itemscope itemtype="https://schema.org/Comment" itemid="https://www.edaboard.com/posts/58279/"> <meta itemprop="parentItem" itemscope itemid="https://www.edaboard.com/threads/phase-detectors-and-envelope-detectors.14355/" /> <span class="u-anchorTarget" id="post-58279"></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/phase-detectors-and-envelope-detectors.14355/post-58279" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2004-01-19T16:45:38+0000" data-time="1074530738" data-date-string="Jan 19, 2004" data-time-string="4:45 PM" title="Jan 19, 2004 at 4:45 PM" itemprop="datePublished">Jan 19, 2004</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/phase-detectors-and-envelope-detectors.14355/post-58279" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/58279/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/phase-detectors-and-envelope-detectors.14355/post-58279" 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/flatulent.3599/"> <meta itemprop="url" content="https://www.edaboard.com/members/flatulent.3599/" /> <div class="message-avatar "> <div class="message-avatar-wrapper"> <a href="/members/flatulent.3599/" class="avatar avatar--m" data-user-id="3599" data-xf-init="member-tooltip"> <img src="/data/avatars/m/3/3599.jpg?1591248332" alt="flatulent" class="avatar-u3599-m" width="96" height="96" loading="lazy" itemprop="image" /> </a> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/flatulent.3599/" class="username " dir="auto" data-user-id="3599" data-xf-init="member-tooltip"><span itemprop="name">flatulent</span></a></h4> <h5 class="userTitle message-userTitle" dir="auto" itemprop="jobTitle">Advanced Member level 6</h5> </div> <img src="/styles/images/ranks/hlevel3.gif" alt="Advanced Member level 6"> <div class="message-userExtras"> <dl class="pairs pairs--justified joinedBlock"> <dt>Joined</dt> <dd>Jul 19, 2002</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed"> <dt>Messages</dt> <dd>4,624</dd> </dl> <dl class="pairs pairs--justified"> <dt> Helped</dt> <dd>489</dd> </dl> <dl class="pairs pairs--justified"> <dt>Reputation </dt> <dd> <a href="/reputation/authors/flatulent.3599" class="fauxBlockLink-linkRow u-concealed">980</a> </dd> </dl> <dl class="pairs pairs--justified"> <dt>Reaction score</dt> <dd>151</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed trophyBlock"> <dt>Trophy points</dt> <dd>1,343</dd> </dl> <dl class="pairs pairs--justified locationBlock"> <dt>Location</dt> <dd> <a href="/misc/location-info?location=Middle+Earth" rel="nofollow noreferrer" target="_blank" class="u-concealed">Middle Earth</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"> 46,689 </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-58279" data-lb-caption-desc="flatulent · Jan 19, 2004 at 4:45 PM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper">You will need a local phase reference to do the angels. QAM is expensive enough to do that you should not economize on the detector method. Using the I and Q coherent detectors and level slicers should be done.<br /> <br /> If you are making a low cost system, OOK or FSK would be cheaper.</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="reactionsBar js-reactionsList "> </div> <br/> <div class="js-historyTarget message-historyTarget toggleTarget" data-href="trigger-href"></div> </footer> </div> </div> </div> </article> <article class="message message--post js-post js-inlineModContainer " data-author="alexyscrypki" data-content="post-58293" id="js-post-58293" itemscope itemtype="https://schema.org/Comment" itemid="https://www.edaboard.com/posts/58293/"> <meta itemprop="parentItem" itemscope itemid="https://www.edaboard.com/threads/phase-detectors-and-envelope-detectors.14355/" /> <span class="u-anchorTarget" id="post-58293"></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/phase-detectors-and-envelope-detectors.14355/post-58293" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2004-01-19T18:23:13+0000" data-time="1074536593" data-date-string="Jan 19, 2004" data-time-string="6:23 PM" title="Jan 19, 2004 at 6:23 PM" itemprop="datePublished">Jan 19, 2004</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/phase-detectors-and-envelope-detectors.14355/post-58293" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/58293/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/phase-detectors-and-envelope-detectors.14355/post-58293" 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/alexyscrypki.9190/"> <meta itemprop="url" content="https://www.edaboard.com/members/alexyscrypki.9190/" /> <div class="message-avatar "> <div class="message-avatar-wrapper"> <a href="/members/alexyscrypki.9190/" class="avatar avatar--m avatar--default avatar--default--dynamic" data-user-id="9190" data-xf-init="member-tooltip" style="background-color: #336666; color: #88c3c3"> <span class="avatar-u9190-m" role="img" aria-label="alexyscrypki">A</span> </a> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/alexyscrypki.9190/" class="username " dir="auto" data-user-id="9190" data-xf-init="member-tooltip"><span itemprop="name">alexyscrypki</span></a></h4> <h5 class="userTitle message-userTitle" dir="auto" itemprop="jobTitle">Junior Member level 1</h5> </div> <img src="/styles/images/ranks/clevel1.gif" alt="Junior Member level 1"> <div class="message-userExtras"> <dl class="pairs pairs--justified joinedBlock"> <dt>Joined</dt> <dd>Sep 29, 2003</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed"> <dt>Messages</dt> <dd>19</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/alexyscrypki.9190" 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>1,281</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"> 112 </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-58293" data-lb-caption-desc="alexyscrypki · Jan 19, 2004 at 6:23 PM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper">I point you to chapter 8 of Digital Modulation Techniques book.<br /> <br /> <br /> Link to the book <br /> <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> <br /> **broken link removed**</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="reactionsBar js-reactionsList "> </div> <br/> <div class="js-historyTarget message-historyTarget toggleTarget" data-href="trigger-href"></div> </footer> </div> </div> </div> </article> <article class="message message--post js-post js-inlineModContainer " data-author="my8os" data-content="post-58294" id="js-post-58294" itemscope itemtype="https://schema.org/Comment" itemid="https://www.edaboard.com/posts/58294/"> <meta itemprop="parentItem" itemscope itemid="https://www.edaboard.com/threads/phase-detectors-and-envelope-detectors.14355/" /> <span class="u-anchorTarget" id="post-58294"></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/phase-detectors-and-envelope-detectors.14355/post-58294" rel="nofollow" itemprop="url"> <time class="u-dt" dir="auto" datetime="2004-01-19T19:13:09+0000" data-time="1074539589" data-date-string="Jan 19, 2004" data-time-string="7:13 PM" title="Jan 19, 2004 at 7:13 PM" itemprop="datePublished">Jan 19, 2004</time> </a> </li> </ul> <ul class="message-attribution-opposite message-attribution-opposite--list "> <li> <a href="/threads/phase-detectors-and-envelope-detectors.14355/post-58294" class="message-attribution-gadget" data-xf-init="share-tooltip" data-href="/posts/58294/share" aria-label="Share" rel="nofollow"> <i class="fa--xf fal fa-share-alt" aria-hidden="true"></i> </a> </li> <li> <a href="/threads/phase-detectors-and-envelope-detectors.14355/post-58294" rel="nofollow"> #4 </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/my8os.11833/"> <meta itemprop="url" content="https://www.edaboard.com/members/my8os.11833/" /> <div class="message-avatar "> <div class="message-avatar-wrapper"> <a href="/members/my8os.11833/" class="avatar avatar--m avatar--default avatar--default--dynamic" data-user-id="11833" data-xf-init="member-tooltip" style="background-color: #e0a385; color: #8f4724"> <span class="avatar-u11833-m" role="img" aria-label="my8os">M</span> </a> </div> </div> <div class="message-userDetails"> <h4 class="message-name"><a href="/members/my8os.11833/" class="username " dir="auto" data-user-id="11833" data-xf-init="member-tooltip"><span itemprop="name">my8os</span></a></h4> <h5 class="userTitle message-userTitle" dir="auto" itemprop="jobTitle">Junior Member level 3</h5> </div> <img src="/styles/images/ranks/clevel3.gif" alt="Junior Member level 3"> <div class="message-userExtras"> <dl class="pairs pairs--justified joinedBlock"> <dt>Joined</dt> <dd>Dec 15, 2003</dd> </dl> <dl class="pairs pairs--justified pairs--xbBoxed"> <dt>Messages</dt> <dd>26</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/my8os.11833" 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>1,281</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"> 171 </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-58294" data-lb-caption-desc="my8os · Jan 19, 2004 at 7:13 PM"> <article class="message-body js-selectToQuote"> <div itemprop="text"> <div class="bbWrapper">Thanks for your replies. Sorry I wasn't quite specific. <br /> The QAM modulation (and demodulation) is done digitally and afterwards that I/Q is combined digitally, oversampled and then converted to analog at an IF freq of let's say 30MHz using eg @D9856.<br /> (Taken from @D: The @D9856 integrates a high-speed direct-digital synthesizer (DDS), a high-performance, high-speed 12-bit Digital-to-Analog converter (DAC), clock multiplier circuitry, digital filters, and other DSP functions onto a single chip, to form a complete quadrature digital upconverter device. The @D9856 is primarily intended to function as a universal upstream and downstream I/Q modulator for interactive HFC cable network applications, where cost, size, power dissipation, and dynamic performance are critical attributes.)<br /> <br /> What I want to do is design a predistortion circuit in the Tx path right after the low pass filtering of the Tx DAC and for this I need amplitude and phase info which is not available from the baseband modem.</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="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": "WebPage", "url": "https://www.edaboard.com/threads/phase-detectors-and-envelope-detectors.14355/", "mainEntity": { "@type": "DiscussionForumPosting", "@id": "https://www.edaboard.com/threads/phase-detectors-and-envelope-detectors.14355/", "headline": "Phase detectors and envelope detectors", "datePublished": "2004-01-19T14:54:34+00:00", "url": "https://www.edaboard.com/threads/phase-detectors-and-envelope-detectors.14355/", "articleSection": "Analog Circuit Design", "author": { "@type": "Person", "@id": "https://www.edaboard.com/members/my8os.11833/", "name": "my8os", "url": "https://www.edaboard.com/members/my8os.11833/" }, "interactionStatistic": [ { "@type": "InteractionCounter", "interactionType": "https://schema.org/ViewAction", "userInteractionCount": 4083 }, { "@type": "InteractionCounter", "interactionType": "https://schema.org/CommentAction", "userInteractionCount": 3 }, { "@type": "InteractionCounter", "interactionType": "https://schema.org/LikeAction", "userInteractionCount": 0 } ], "articleBody": "envelope detectors\n\nI'd like to extract a QAM signal's amplitude and phase from its IF (@40MHz) signal.\nI figure an envelope and phase detector will do the job, however I'd like some more information on the design issues entailed. Can anyone point me to a paper or book that describes these in some detail?\n\nAlso is there another way to get amplitude&phase?" }, "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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Phase detectors and envelope detectors | Forum for Electronics