Using a composite source-follower with positive feedback to synthesize complex poles, a single-branch CMOS biquad achieves large linearity at low overdrive voltage, saving power. In 0.18μm CMOS with a 1.8V supply, a 4 th-order 10MHz filter for WLAN applications achieves 17.5dBm IIP3 and -40dB HD3 for a 600mVpp_diff input signal amplitude. A 24μV rms noise gives a 79dB DR while drawing 2.25mA from 1.8V.
D'Amico, S., Conta, M., Baschirotto, A. (2006). A 4.1mW 79dB-DR 4th-order Source-Follower Based Continuous-Time Filter for WLAN Receivers. In IEEE International Solid-State Circuits Conference, 2006. ISSCC 2006. Digest of Technical Papers (pp.343-352). Institute of Electrical and Electronics Engineers Inc. [10.1109/ISSCC.2006.1696187].
A 4.1mW 79dB-DR 4th-order Source-Follower Based Continuous-Time Filter for WLAN Receivers
BASCHIROTTO, ANDREA
2006
Abstract
Using a composite source-follower with positive feedback to synthesize complex poles, a single-branch CMOS biquad achieves large linearity at low overdrive voltage, saving power. In 0.18μm CMOS with a 1.8V supply, a 4 th-order 10MHz filter for WLAN applications achieves 17.5dBm IIP3 and -40dB HD3 for a 600mVpp_diff input signal amplitude. A 24μV rms noise gives a 79dB DR while drawing 2.25mA from 1.8V.
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