A novel all-MOS high-speed continuous-time filter

A new continuous-time transistor-only bandpass/lowpass filter based on g/sub m//C integrators that is capable of realizing critical frequencies in excess in 10 MHz is described. The center frequency, Q, and voltage gain are all voltage-tunable over a 10:1 range. The integrators use a novel, fully balanced, source-degenerated transconductor which maintains less than 1% nonlinearity for differential inputs up to 2 V. A second-order state variable filter with a nominal f/sub 0/=3.2 MHz and Q=5 consumes only 20 mW from a single-ended 5-V supply.<>