A Biquadratic Cell Based on the Flipped-Source-Follower Circuit
- 19 September 2016
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Circuits and Systems II: Express Briefs
- Vol. 64 (8), 867-871
- https://doi.org/10.1109/tcsii.2016.2611061
Abstract
This paper presents a novel biquadratic cell (biquad) based on the Flipped-Source-Follower (FSF) circuit. The main idea is to exploit the FSF circuit as basic building block for a lowpass 2nd-order filter, taking advantage of its well known strengths, like low output impedance, low-noise, large in-band linearity, and low-power. Thanks to the very essential FSF circuit, the resulting biquad is a power efficient broad bandwidth stage, with very low-noise performance. In order to validate the biquadratic cell design idea, extensive circuital simulation results will be presented. The filter design example synthesizes a 3rd-order low-pass transfer function and consumes 2.3mW from a single 1.8V@V $_{DD}$ . Input noise spectral density is 7nV/√Hz. Linearity has been evaluated in terms of IIP3 (25dBm) and THD (-40dBc at 380mV $_{0-PEAK}$ output voltage swing, resulting in 62dB SNR). Hence a very promising Figure-of-Merit (i.e. 165J-1) has been achieved.
Keywords
This publication has 19 references indexed in Scilit:
- A 33 MHz 70 dB-SNR Super-Source-Follower-Based Low-Pass Analog FilterIEEE Journal of Solid-State Circuits, 2015
- A Compensation Technique for Two-Stage Differential OTAsIEEE Transactions on Circuits and Systems II: Express Briefs, 2014
- A Fifth-Order 20-MHz Transistorized-$LC$ -Ladder LPF With 58.2-dB SFDR, 68-$\mu\hbox{W/Pole/MHz}$ Efficiency, and 0.13-$\hbox{mm}^{2}$ Die Size in 90-nm CMOSIEEE Transactions on Circuits and Systems II: Express Briefs, 2013
- Active-RC Filters Using the Gm-Assisted OTA-RC TechniqueIEEE Journal of Solid-State Circuits, 2011
- A CMOS 4.35-mW +22-dBm IIP3 Continuously Tunable Channel Select Filter for WLAN/WiMAX ReceiversIEEE Journal of Solid-State Circuits, 2011
- Attenuation-Predistortion Linearization of CMOS OTAs With Digital Correction of Process Variations in OTA-C Filter ApplicationsIEEE Journal of Solid-State Circuits, 2010
- A 0.55 V 60 dB-DR Fourth-Order Analog Baseband FilterIEEE Journal of Solid-State Circuits, 2009
- A 1-V +31 dBm IIP3, Reconfigurable, Continuously Tunable, Power-Adjustable Active-RC LPFIEEE Journal of Solid-State Circuits, 2009
- A 4.1-mW 10-MHz Fourth-Order Source-Follower-Based Continuous-Time Filter With 79-dB DRIEEE Journal of Solid-State Circuits, 2006
- A 500 MHz CMOS anti-alias filter using feed-forward op-amps with local common-mode feedbackPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2003