Programmable floating-gate second-order sections for Gm-C filter applications

We present programmable, fully-differential G/sub m/-C second-order sections showing tunability over a wide range of frequencies. The second-order sections use a floating-gate operational transconductance amplifier (FG-OTA) to realize tunability. We present experimental results showing frequency- and Q-tuning for a lowpass (LPSOS) and a bandpass second-order section (BPSOS) designed using these FG-OTAs. Measured 1-dB compression for LPSOS and BPSOS are -15 dBm and -11 dBm, respectively. The presented circuits are fabricated in a 0.5 /spl mu/m n-well CMOS process available through MOSIS.