The design and analysis of a RF CMOS bandpass filter

Abstract

A high-Q filter capable of operating in the GHz range is proposed. This filter, which is suitable for RF applications, utilizes two effective Q-enhancement techniques to circumvent the low-Q characteristics inherent in the circuit. Simulation results employing standard 0.5 /spl mu/m CMOS technology have successfully verified that the center frequency tuning and hybrid Q-tuning techniques operate between 625 MHz and 1.68 GHz center frequencies with Q ranging from 12 to over 300. Two tunable bandpass filters with center frequencies at 876 MHz and 1.68 GHz have been designed to have 37 dB and 31.4 dB voltage gain, -30 dBm and -31 dBm IIP3, and 4.8 dB and 5.5 dB NF, respectively. Both filters have quality factors equal to 33 and power dissipation is equal to 24.3 mW.