论文信息 - A power-efficient current-feedback instrumentation amplifier for precision bridge readout

A power-efficient current-feedback instrumentation amplifier for precision bridge readout

A current-feedback instrumentation amplifier (CFIA) for precision bridge-readout intended for MEMs flow sensor is presented. The proposed CFIA is chopped to bring input-referred offset below 12μV and flicker-noise corner around 2mHz. Implemented in chartered 0.18μm CMOS process, the CFIA draws 250μA supply current and achieves a competitive noise efficiency factor (NEF) of 30.5. The low-power consumption is attributed to the gm/ID based design methodology adopted in designing the folded-cascode amplifiers while considering careful trade-offs between power, thermal noise and input-referred offset.

Amine Bermak | Saqib Mohamad | Moaaz Ahmed

[1] Denis Flandre,et al. A gm/ID based methodology for the design of CMOS analog circuits and its application to the synthesis of a silicon-on-insulator micropower OTA , 1996, IEEE J. Solid State Circuits.

[2] Kofi A. A. Makinwa,et al. A Current-Feedback Instrumentation Amplifier With a Gain Error Reduction Loop and 0.06% Untrimmed Gain Error , 2011, IEEE J. Solid State Circuits.

[3] W.M.C. Sansen,et al. A micropower low-noise monolithic instrumentation amplifier for medical purposes , 1987 .

[4] Wilko J. Kindt,et al. A 140 dB-CMRR Current-Feedback Instrumentation Amplifier Employing Ping-Pong Auto-Zeroing and Chopping , 2010, IEEE Journal of Solid-State Circuits.

[5] J.H. Huijsing,et al. A chopper and auto-zero offset-stabilized CMOS instrumentation amplifier , 2009, 2009 Symposium on VLSI Circuits.

[6] Gabor C. Temes,et al. Circuit techniques for reducing the effects of op-amp imperfections: autozeroing, correlated double sampling, and chopper stabilization , 1996, Proc. IEEE.

[7] Kofi A. A. Makinwa,et al. The design of a chopped current-feedback instrumentation amplifier , 2008, 2008 IEEE International Symposium on Circuits and Systems.