The principle of digital correction for analog quadrature modulator imbalance

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Overview:

Wide Bandwidth Wireless Transmitters commonly use analog quadrature modulators (AQM) to convert composite (I + j*Q) baseband signals to radio frequency (RF). The AQM contains a local oscillator (LO) input, a phase splitter that generates two LO 90 degrees out of phase, two mixers (each mixer mixes the baseband signal to RF) and a combination of two Adder of signals (Figure 1). /> Figure 1: Structure diagram of the analog quadrature modulator system (please read the PDF document for details) </div> </div> <div class="tech-detail-share"> <!-- Baidu Button BEGIN -- > <div class="bdsharebuttonbox"> <a href="#" class="bds_qzone" data-cmd="qzone" title="Share to QQ Space"></a> <a href="#" class= "bds_tsina" data-cmd="tsina" title="Share to Sina Weibo"></a> <a href="#" class="bds_weixin" data-cmd="weixin" title="Share to WeChat" ></a> <span>Share to:</span> </div> <script>window._bd_share_config = { "common": { "bdSnsKey": {}, "bdText": "", "bdMini": "1", "bdMiniList": false, "bdPic": "", "bdStyle": "2", "bdSize": "16" }, "share": {} }; with (document) 0[(getElementsByTagName (

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