Sign Changer using Op-Amp

Applications of Operational Amplifiers in Tamil

Sign Changer

Instrumentation Amplifier

Sign Changer

  • The basic inverting amplifier configuration using an op-amp with input impedance Z1 and feedback impedance Zf.
  • If the impedance Z1 and Zf are equal in magnitude and phase, then the closed loop voltage gain is -1, and the input signal will undergo a 180° phase shift at the output. Hence, such circuit is also called phase inverter.
  • If two such amplifiers are connected in cascade, then the output from the second stage is the same as the input signal without any change of sign. Hence, the outputs from the two stages are equal in magnitude but opposite in phase and such a system is an excellent paraphase amplifier.

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