This paper presents a 4th-order low-pass continuous-time filter with 21.4 MHz bandwidth. Using a positivefeedback in combination with resistors, this architecture synthesizes two complex conjugate poles. The filter is designed and optimized to feature high-linearity along all filter passband, and, in particular, at the cut-off frequency edge. The filter consumes only 100 μA with 1.8V voltage supply, and achieves 45μW/pole power consumption, 300 μVRMS input-referred noise, 21.9 dBm IIP3 with 2-3 MHz input tones and 12dBm IIP3 near the cut frequency using 19-20 MHz tones.
D'Amico, A., DE MATTEIS, M., D'Amico, S., Crespi, L., Baschirotto, A. (2015). A 4th-order low-power diode-C-based filter with 12dBm-IIP3 at the cut-off frequency. In 2015 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS (ISCAS) (pp.2656-2659). Institute of Electrical and Electronics Engineers Inc. [10.1109/ISCAS.2015.7169232].
A 4th-order low-power diode-C-based filter with 12dBm-IIP3 at the cut-off frequency
D'AMICO, ANTONIOPrimo
;DE MATTEIS, MARCELLOSecondo
;BASCHIROTTO, ANDREAUltimo
2015
Abstract
This paper presents a 4th-order low-pass continuous-time filter with 21.4 MHz bandwidth. Using a positivefeedback in combination with resistors, this architecture synthesizes two complex conjugate poles. The filter is designed and optimized to feature high-linearity along all filter passband, and, in particular, at the cut-off frequency edge. The filter consumes only 100 μA with 1.8V voltage supply, and achieves 45μW/pole power consumption, 300 μVRMS input-referred noise, 21.9 dBm IIP3 with 2-3 MHz input tones and 12dBm IIP3 near the cut frequency using 19-20 MHz tones.
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