A low-voltage current-mode instrumentation amplifier designed in a 0.18-micron CMOS technology

A low-voltage current-mode instrumentation amplifier designed in a 0.18 /spl mu/m CMOS process for biomedical applications is presented. The low-voltage technology chosen presented several challenges. The basic design was modified to incorporate low-voltage current mirrors and native NFETs. A common-mode rejection ratio (CMRR) of 143 dB after extraction was achieved, with a differential gain of 100 V/V. Several advanced layout geometries were used to ensure proper matching between key circuit elements. The design has been submitted for fabrication to CMC to allow validation and testing.

[1]  Mohamad Sawan,et al.  New low-power low-voltage high-CMRR CMOS instrumentation amplifier , 1999, ISCAS'99. Proceedings of the 1999 IEEE International Symposium on Circuits and Systems VLSI (Cat. No.99CH36349).

[2]  Phillip E. Allen,et al.  A low-voltage, bulk-driven MOSFET current mirror for CMOS technology , 1995, Proceedings of ISCAS'95 - International Symposium on Circuits and Systems.

[3]  F. J. Lidgey,et al.  Common-mode rejection ratio in current-mode instrumentation amplifiers , 1995 .

[4]  J. Ramirez-Angulo.  Current mirrors with low input and low output voltage requirements , 1994, Proceedings of 1994 37th Midwest Symposium on Circuits and Systems.

[5]  F. J. Lidgey,et al.  Improvements to opamp power-supply current sensing technique , 1994 .

[6]  S. Porta,et al.  Analysis of IC op-amp power-supply current sensing , 1994, Proceedings of IEEE International Symposium on Circuits and Systems - ISCAS '94.