A Very Low Power 10 MHz CMOS Continuous-Time Bandpass Filter with On-Chip Automatic Tuning

Abstract

A second-order CMOS continuous-time bandpass filter with a tuneable 4-12 MHz center frequency (f c ) is presented. The Design has been done by using a new second-order block which is based on G m - C method. This G m - C filter achieves a dynamic range of 30 dB for 1% IM3, and Q equal to 58 at 12 MHz, while dissipating only 10.5 mW from 3.3 V power supply in 0.35 μm CMOS process. The on-chip indirect automatic tuning circuit uses a phase-locked loop which sets filter center frequency to an external reference clock.