A low noise integrated AMPS IF filter

A 455 KHz IF filter suitable for AMPS cellular telephone applications has been developed in a 1.2 /spl mu/m CMOS technology. The design is based on interspersion of repeated AGC and leapfrog g/sub m/-C stages. Including RSSI circuitry, the active area is 17 mm/sup 2/. It draws 6.5 mA from a single ended 5 V supply. Measured results confirm a dynamic range of 64 dB and an S/(N+D) of 40 dB, sufficient for AMPS cellular applications.<
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