A 0.8-V accurately tuned linear continuous-time filter

An accurately tuned low-voltage linear continuous-time filter is presented in this paper. Accurate tuning is achieved using time-constant matched master-slave tuning combined with power-up mismatch calibration. A low-pass biquad designed for a corner frequency of 115 kHz achieves better than -80-dB total harmonic distortion with a 250-mV(pp) 10-kHz input signal. The prototype implemented in 0.18-mu m CMOS process occupies an area of 0.4 mm(2) and dissipates 4.6 mW (2.6 mW for the filter and 2 mW for tuning) of power.