Voltage- and current-controlled high CMRR instrumentation amplifier using CMOS current conveyors

Authors: HAMDİ ERCAN, SEZAİ ALPER TEKİN, MUSTAFA ALÇI

Abstract: A new approach to the design of an instrumentation amplifier using only 2 CMOS current-controlled conveyors and an active resistor is introduced. The new approach, which has no passive components, offers a wide bandwidth and a high common-mode rejection ratio (CMRR). Electronically controllable gain by voltage and current is also obtained by this new circuit. The circuit is simulated using the parameters of a 0.35-\mu m TSMC CMOS technology. Theoretical analysis of the circuits was carried out, and the performance of the block circuit was confirmed through PSpice simulation results.

Keywords: Current-mode circuits, Instrumentation amplifier, CMOS current conveyor, Common-mode rejection ratio (CMRR)

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