CMOS Ring Amplifier for Bio-Signal LNA

Low power wireless medical devices have attracted great research interests, which need the low noise amplifier (LNA) to amplify bio-signals. And power efficient amplification in scaled CMOS technologies remains a persistent challenge. Ring amplification technique, with a similar structure to CMOS ring oscillators, has the potential to achieve high gain with minimal power dissipation as well as efficient amplification in scaled environments. CMOS ring amplifiers possess the benefits of scalable power-delay production and efficient slew-based charging. So, the application of the ring amplification technique to low power LNA design is investigated in the paper. The approach of ring amplifier with single-ended structure is not suitable for LNA design. Then the pseudo differential amplifier with float sampling scheme is proposed, which is suitable for the purpose of noise reduction with chopper technique. This structure can also eliminate the need for additional common mode feedback in differential processing of signals. Experiments simulation has verified that the bio-signal can be properly processed with the provided design.

[1]  Bengt E. Jonsson On CMOS scaling and A/D-converter performance , 2010, NORCHIP 2010.

[2]  Jan Craninckx,et al.  A 1-GS/s, 12-b, Single-Channel Pipelined ADC With Dead-Zone-Degenerated Ring Amplifiers , 2019, IEEE J. Solid State Circuits.

[3]  H Gossner,et al.  Toward System on Chip (SoC) Development Using FinFET Technology: Challenges, Solutions, Process Co-Development & Optimization Guidelines , 2011, IEEE Transactions on Electron Devices.

[4]  Kazuki Sobue,et al.  A 61.5dB SNDR pipelined ADC using simple highly-scalable ring amplifiers , 2012, 2012 Symposium on VLSI Circuits (VLSIC).

[5]  Jan Craninckx,et al.  A single-channel, 600Msps, 12bit, ringamp-based pipelined ADC in 28nm CMOS , 2017, 2017 Symposium on VLSI Circuits.

[6]  H. E. Chandler,et al.  Technical writer's handbook , 1982, IEEE Transactions on Professional Communication.

[7]  Kazuki Sobue,et al.  Ring Amplifiers for Switched Capacitor Circuits , 2012, IEEE Journal of Solid-State Circuits.

[8]  Michael P. Flynn,et al.  11.5 A 100MS/s 10.5b 2.46mW comparator-less pipeline ADC using self-biased ring amplifiers , 2014, 2014 IEEE International Solid-State Circuits Conference Digest of Technical Papers (ISSCC).

[9]  Liam Kilmartin,et al.  Compressed Sensing for Bioelectric Signals: A Review , 2015, IEEE Journal of Biomedical and Health Informatics.

[10]  Atsushi Iwata,et al.  Low power and low voltage chopper amplifier without LPF , 2008, IEICE Electronics Express.

[11]  Yu (Kevin) Cao,et al.  What is Predictive Technology Model (PTM)? , 2009, SIGD.