A dual-band tri-mode CDMA IF receiver with programmable channel-match filter

An integrated dual-band tri-mode CDMA IF receiver with programmable channel-match filter is presented. The cascaded VGA and filter chain provides maximum voltage gain of 93 dB with noise figure of 88 dB of gain control range. The IF VCO, which operates at 2/spl times/LO for PCS mode and 4/spl times/LO for AMPS/CDMA mode, achieves -131 dBc/Hz of phase noise at 900 kHz offset with an external tank. An area-efficient combined channel-match filter chain for both CDMA/PCS and AMPS mode is realized by changing the clock frequency of a switched-capacitor filter and by switching-in and -out capacitors for the continuous time and switch-cap filters depending on the mode of operation. The filter chain meets all the blocker requirements for both CDMA/PCS and AMPS modes. Combining the CDMA/PCS and AMPS filter saves 30% die area compared to separate filter chains. The IC is fabricated in Jazz's 35 GHz ft silicon BiCMOS process and packaged into a 48-pin 6 mm/spl times/6 mm land grid array (RF-LGA/spl trade/) chipscale package.