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  • The Open-loop gain called the Gain Bandwidth Product, or (GBP) can be very high and is a measure of how good an amplifier is.
  • Very high GBP makes an operational amplifier circuit unstable as a micro volt input signal causes the output voltage to swing into saturation.
  • By the use of a suitable feedback resistor, (  ) the overall gain of the amplifier can be accurately controlled.

Differential and Summing Amplifiers

differential and summing amplifiers
  • By adding more input resistors to either the inverting or non-inverting inputs Voltage Adders or Summers can be made.
  • Voltage follower op-amps can be added to the inputs of Differential amplifiers to produce high impedance Instrumentation amplifiers.
  • The Differential Amplifier produces an output that is proportional to the difference between the 2 input voltages.

Differentiator and Integrator Operational Amplifier Circuits

differentiator and integrator amplifiers
  • The Integrator Amplifier produces an output that is the mathematical operation of integration.
  • The Differentiator Amplifier produces an output that is the mathematical operation of differentiation.
  • Both the Integrator and Differentiator Amplifiers have a resistor and capacitor connected across the op-amp and are affected by its RC time constant.
  • In their basic form, Differentiator Amplifiers suffer from instability and noise but additional components can be added to reduce the overall closed-loop gain.

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