A Quadrature Charge-Domain Filter with Frequency Down-Conversion and Filtering for RF Receivers

摘要

A quadrature charge-domain filter (QCDF) for frequency down-conversion and filtering is proposed. After measurement of QCDF by a 1072-MS/s sampling rate, a stop-band attenuation and bandwidth were 53-dB and 44-MHz, respectively. For quadrature performance after down-conversion, this QCDF provided -27.67-dB EVM upon a 64-QAM signal with 54-Mb/s. This chip consumed 7.7-mA power current upon a 1.2-V supply and occupied 0.08-mm{sup}2 in 90-nm CMOS process.