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A 10.7-MHz 68-dB SNR CMOS continuous-time filter with on-chip automatic tuning

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3 Author(s)
Silva-Martinez, J. ; Dept. of Electr. Eng., Katholieke Univ., Leuven, Belgium ; Steyaert, M.S.J. ; Sansen, Willy

A maximally flat 10.7-MHz fourth-order bandpass filter with an on-chip automatic tuning system is presented. The signal-to-in-band integrated noise ratio (SNR) of the automatically tuned filter is around 68 dB. The third intermodulation distortion (IM3) is lower than -40 dB for a two-tone input signal of 3.2 V peak to peak (Vp-p). The complete system operates with supply voltages of ±2.5 V. The power consumption of the system is 220 mW. All this has been achieved due to the use of a low-distortion transconductor, the development of a high-frequency CMOS resistor, and the realization of an advanced on-chip automatic tuning system for both frequency and bandwidth control. The chip has been fabricated in a standard 1.5-μm n-well CMOS process

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:27 ,  Issue: 12 )