A current-mode wheatstone bridge employing only single DO-CDTA

Abstract

This article proposes a topology of current-mode improved Wheatstone bridge based on dual-output current differencing transconductance amplifier (DO-CDTA). The features of the proposed configuration are that: magnitude of output signal can be controlled via the input bias currents; the proposed circuit is low temperature sensitive, the circuit description is very simple. The circuit performances are depicted through PSPICE simulations, they show good agreement to theoretical anticipation and provide ability to measure small resistance changes at a wide range of frequency (more than 60 MHz). The power consumption is approximately 4.55 mW at ~1.5 V supply voltages.