| 摘要 |
An AMPS receiver system utilizing a ZIF architecture and processing received forward link signals in the digital domain. The AMPS receiver system includes an antenna ( 105 ), a direct converter ( 110 ), high dynamic A/D converters ( 120,130 ), low pass filters ( 140, 150 ), a phase shifter ( 160 ), a digital VGA ( 170 ), a digital FM demodulator ( 180 ), an accumulator ( 185 ) and a controller ( 190 ). The direct converter ( 110 ) further includes a low noise amplifier ( 112 ), a splitter ( 113 ), mixers ( 114,116 ) and low pass filters ( 118,119 ). The controller ( 190 ) adjusts the gains of the low noise amplifier ( 112 ) and the digital VGA ( 170 ) based on the average power of the signal outputted by the digital VGA ( 170 ).
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