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A quadrature charge-domain filter (QCDF) is proposed for downconversion and filters in RF receivers. The QCDF is designed with a chosen IF of 268 MHz, which is assumed a downconverted signal from 802.11 g RF signals by a subsampling or subharmonic mixer. Through a sampling rate of 1072 MS/s, the QCDF possessed 53-dB stopband attenuation, 32.51-dB alias-band attenuation, and 44-MHz bandwidth. For quadrature...
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