Abstract
This paper presents a channel-select filter for 2.4GHz low-IF Bluetooth transceiver application. Besides of channel selection, image signal rejection, automatic gain control (AGC) and signal strength indication functions are all integrated. 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 simplified op-amp structure are employed for power minimization. Measurement results indicate that the image rejection and the adjacent channel selectivity are better than 40dB and 60dB respectively. With a 0.25μm 1P5M CMOS technology the proposed filter dissipates 11.8mA from a single 2.5V supply voltage.