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Intermediate-frequency amplifier
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<h2 id="uses">Uses</h2> <p>IF amplifiers in <a href="/facts/Heterodyne_receiver/S2SA0NCV">heterodyne receivers</a> apply gain in a frequency band between the input <a href="/facts/Radio_frequency/aWku7h4R">radio frequency</a> and output <a href="/facts/Audio_frequency/LzHtINcf">audio frequency</a> or <a href="/facts/Video_frequency/6BxCvcEn">video frequency</a>, often following one stage of <a href="/facts/RF_amplifier/zGWS965K">RF amplifier</a>. This allows most of the gain in the form of a fixed-frequency amplifier, simplifying tuning. Compare to its predecessor, the <a href="/facts/Tuned_RF_receiver/UTFAQHzx">tuned RF receiver</a>. IF amplifiers might use <a href="/facts/Double-tuned_amplifier/7jXqPdx3">double-tuned amplifiers</a> or <a href="/facts/Staggered_tuning/f7TIFm1f">staggered tuning</a> to generate the appropriate frequency response needed. Some use more than one IF frequency. </p> <h2 id="commonly-used-circuits">Commonly used circuits</h2> <ul><li>Mutual inductance coupling: contains two windings that are joined by mutual inductance.</li> <li>Shunt capacitance coupling: These circuits have a wide pass band.</li> <li>composite IF transformers: receivers used for A-M and F-M receivers.<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a><a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a></li></ul> <h2 id="external-links">External links</h2> <p> Media related to IF amplifiers at Wikimedia Commons </p> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Walker, H. R. (2005). "Intermediate-Frequency Amplifiers". Encyclopedia of RF and Microwave Engineering. doi:10.1002/0471654507.eme187. ISBN 978-0471654506. <a href="978-0471654506" target="_blank">978-0471654506</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Sandel, B. "Intermediate Frequency Amplifiers" (PDF). frank.yueksel.org/. Retrieved November 28, 2013. <a href="http://frank.yueksel.org/other/RCA/Radiotron_Designers-Handbook_Fourth-Edition/26-Intermediate-Frequency-Amplifiers.pdf" target="_blank">http://frank.yueksel.org/other/RCA/Radiotron_Designers-Handbook_Fourth-Edition/26-Intermediate-Frequency-Amplifiers.pdf</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>"The Art of Alignment". www.vintage-radio.net. Retrieved 27 January 2019. <a href="https://www.vintage-radio.net/forum/attachment.php?attachmentid=85686&=1383518143" target="_blank">https://www.vintage-radio.net/forum/attachment.php?attachmentid=85686&=1383518143</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> </ol>