Inverting Gain Amplifier

The circuit below shows an inverting gain amplifier using a MCP6XXX op amp. It represents an impedance of R1 to the sensor (Vsen) and produces a negative gain from Vsen to Vout.

inverting-amp.png

Advantages:

  • Resistive isolation from the source
  • Large input voltage range is possible
  • Virtually no input stage distortion
  • Simplicity

Disadvantages:

  • Resistive loading of the source
  • Inverting gain
  • Amplifies common mode noise

Sensor Examples:

  • Thermo pile
  • High-side (Vdd) voltage sensor

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