Abstract
This paper presents an alternative approach to implement a signal conditioning circuit for measuring resistance relative changes of differential resistive sensors. The proposed analog circuit uses two operational conveyors and one operational amplifier (opamp) as active building blocks to produce an output voltage as a function of the relative change of the sensor. In comparison with the classic voltage-mode Wheatstone bridge (VMWB) configuration, the sensor relative change can be estimated by the proposed circuit without using any sensor reference resistor. Surpassing a current-mode Wheatstone bridge (CMWB) using second-generation current conveyors (CCIIs), the proposed configuration provides higher accuracy. Compared to existing mixed-mode configurations realized in integrated circuit form, the proposed circuit offers simpler construction. PSPICE simulation and experimental results are given to verify the effectiveness of the proposed circuit. Test results obtained by utilizing the implemented prototype for a commercial linear position sensor are also included.
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