Using Digital Potentiometers For Programmable Amplifier Gain
Source: Microchip Technology Inc.
By Microchip Technology Inc.
Usually a sensor requires its output signal to be amplified before being converted to a digital representation. Many times an operational amplifier (op amp) is used to implement a signal gain circuit. The programmability of this type of circuit allows the following issues to be solved:
- Optimization of the sensor output voltage range
- Calibration of the amplifier circuit’s gain
- Adapting gain to input signal variations
- sensor characteristics change over temperature/voltage
- multiple input sources into a single gain circuit
- Field calibration updates
- Increased reliability vs mechanical potentiometer
- BOM consolidation – one op amp and one digital potentiometer supporting the various sensor options
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