In this paper, a 4th-order low-pass continuous-time analog filter is presented, that is implemented with the cascade of two efficient and compact biquadratic cells, realized using the Super-Source-Follower topology. The biquadratic cell uses only two capacitors and four transistors: two transistors for the signal processing and two transistors as current sources for biasing purpose. The 4th-order filter prototype has been integrated in 0.18 μm CMOS technology. For a 33 MHz cut-off frequency, the filter performs 18 dBm-IIP3 for two tones at 2 MHz and 3 MHz, with total current of 770 μA from a single 1.8 V supply voltage.
De Matteis, M., Pezzotta, A., D'Amico, S., Baschirotto, A. (2015). A 33 MHz 70 dB-SNR super-source-follower-based low-pass analog filter. IEEE JOURNAL OF SOLID-STATE CIRCUITS, 50(7), 1516-1524 [10.1109/JSSC.2015.2411626].
A 33 MHz 70 dB-SNR super-source-follower-based low-pass analog filter
De Matteis, M
;Pezzotta, A
;Baschirotto, A.
2015
Abstract
In this paper, a 4th-order low-pass continuous-time analog filter is presented, that is implemented with the cascade of two efficient and compact biquadratic cells, realized using the Super-Source-Follower topology. The biquadratic cell uses only two capacitors and four transistors: two transistors for the signal processing and two transistors as current sources for biasing purpose. The 4th-order filter prototype has been integrated in 0.18 μm CMOS technology. For a 33 MHz cut-off frequency, the filter performs 18 dBm-IIP3 for two tones at 2 MHz and 3 MHz, with total current of 770 μA from a single 1.8 V supply voltage.
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