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 filler adopts real resistors for terminations and transconductors of wide common-mode input ra nge. Degradation in passband ripple due to mismatch between termination res istors and transconductors is alleviated by design centering. The filter ac hieves a stopband third-order intermodulation intercept point (IIP3) of 49 dBm, a passband IIP3 of 14 dBm, an input-referred noise of 28 nV/root Hz an d 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.