This is pressure sensor signal conditioning circuit. It is simple and inexpensive circuit because it has small geometry and simple pressure sensor. It just uses a single Operational Amplifier. This circuit obtain power from from 3-V battery. To work properly this circuit must work in 0 C to 50 C temperature range. Here is the schematic diagram :
This simple circuit is used to amplify the pressure sensor’s output voltage to levels that suitable for subsequent digital processing and A/D conversion. ROT is offset trimmer, C1 is used to limit the band. The gain setting of this circuit is RFX/RGX. ±VB is sensor bridge output. [Source: Texas Instruments Application Report]
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