A Highly Linear CMOS - Bandpass Filter with On-Chip Frequency Tuning

A fourteenth-order CMOS transconductance- ( - ) bandpass filter with on-chip automatic frequency tuning is described. By using highly linear - integrators, the filter achieves 75 dB dynamic range over 700 kHz noise bandwidth. The measured intermodulation distortion ( ) @ 600 kHz for a 4 input signal is only 61 dB. On-chip automatic frequency tuning provides more than 300% center frequency range (i.e., 165-505 kHz) of the filter with 1% frequency accuracy. The 0.7- m CMOS filter measures 4.8 mm and consumes 70 mW from a single 5 V power supply.