Filter circuit can be used in the IF amplifier

Published:2011/6/23 21:41:00 Author:TaoXi | Keyword: Filter circuit, IF amplifier | From:SeekIC

The function of the IF amplifier is to supply the gain and the selectivity for the receiver, the selectivity part is realized by different filters. The filters that can be used in the IF amplifier are as shown in the figure. The typical application circuit is as shown in figure (a), the transformer of the figure has the tapping, but the non-tapping transformer also can be used. The tapping can supply the low impedance connection and keep the advantage of the high-impedance tuning circuit. You should notice that the capacitance is usually in the transformer isolation cover. Most of the specialized superheterodyne radio receiver's gain and selectivity are supplied by the intermediate frequency (IF) amplifier, so it is a high-gain narrow-bandwidth amplifier. Figure: All kinds of intermediate frequency filter circuits



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