Abstract
A narrowband frequency-modulation (FM) receiver with high selectivity is implemented using a switched-capacitor baseband intermediate-frequency (IF) filter. Measured adjacent channel selectivity was more than 46 dB, and input sensitivity with -30-dB quieting level was 5 mV without considering a front-end radio-frequency amplifier stage. A fully integrated experimental receiver needs no adjustment or trimming, relying instead on a single reference clock. The prototype chip occupies 12 mm/SUP 2/ and dissipates 20 mW with a 5-V supply.
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