A 2.7-V, 200-kHz, 49-dBm, stopband-IIP3, low-noise, fully balanced gm-C filter IC

This 2.7 V low-distortion, low-noise, fourth order gm-C filter adopts real resistors for terminations and transconductors of wide common mode input range. Degradation in passband ripple due to mismatch between termination resistors and transconductors is alleviated by design centering. The filter achieves a stopband third-order intermodulation intercept point (IIP3) of 49 dBm, a passband IIP3 of 14 dBm, an input-referred noise of 28 nV//spl radic/(Hz) and a common mode rejection ratio of 70 dB. The cutoff frequency is tuned to 200 kHz using a reference resistor. The filter consumes 11.5 mA/channel. It operates even at 2.2 V with a stopband IIP3 of 40 dBm.