A low-power, programmable bandpass filter section for higher-order filter-bank applications

We present a programmable continuous-time bandpass filter with center frequencies ranging from 100 Hz to 10 MHz fabricated in 0.51 /spl mu/m CMOS processes operating at 3.3 V supply. This circuit is compact and low power (0.1 nW-15 /spl mu/W). SNR was 86 dB and 72 dB at 1 MHz for 2/sup nd/- and 4/sup th/-order sections with Qs up to 70 (4/sup th/-order). We fabricated a 6/sup th/- and 10/sup th/-order filter-bank chip. We present results for higher-order filters programmed at 1 MHz with Butterworth coefficients (passband ripple <0.5 dB).