MON4A-5 A 2.5V CMOS Swit ched-Capacit or C hannel-Select Filter with Image Rejection and Automatic Gain Control

This paper presents a channel-select filter for 2.4GHz low-IF Bluetooth transceiver ap- plication. Besides of channel selection, image sig- nal rejection, automatic gain control (AGC) and signal strength indication functions are all inte- grated. High frequency accuracy and large signal dynamic range is given as the switched-capacitor (SC) structure. Circuit techniques like multiple clock rate, filter capacitance scaling, and simpli- fied op-amp structure are employed for power min- imization. Measurement results indicate that the image rejection and the adjacent channel selectivity are better than 40dB and 60dB respectively. With a 0.25pm 1P5M CMOS technology the proposed filter dissipates 11.8mA from a single 2.5V supply voltage.