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Introduction

A well-designed signal conditioning circuit for pressure sensors should perform several critical functions: zero offset (null) adjustment, span (gain) calibration, and temperature compensation of both zero and span. Additionally, it must provide accurate signal amplification and power regulation. In more demanding applications, active nonlinearity correction and frequency response tailoring may also be required to achieve optimal sensor accuracy and stability.

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​This application note details a practical analog signal conditioning circuit designed for temperature-compensated
piezoresistive pressure sensors (see Figure 1). The circuit architecture allows for precise, non-interacting zero and
span calibration using a single power supply. It supports both three-wire voltage output and two-wire current loop
output configurations. The design is compatible with AVSensors' compensated pressure sensor series utilizing
constant current excitation (e.g., CTO Series, CHT-Series, MIOF-xxx CC Series).

 

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