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Various IF filters circuit

2017-02-12 14:49  
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Various IF filters circuit
Most of the gain and selectivity of superheterodyne radio receivers are provided by the intermediate frequency (IF) amplifier. Therefore, it is a amplifier with high-gain and narrow bandwidth. IF power gain is typically between 60 dB and 120dB. Scuh range depends on the specific design for the receiver. Usually it has a much narrower bandwidth than the RF amplifier. For example, SSB receiver’s bandwidth is 2.8kHz and the CW receiver’s bandwidth is 500Hz. IF amplifier's role is to provide gain and selectivity for the receiver. The selective parts are achieved by a variety of filters.