Operational Amplifiers Circuits Quiz

Different Circuits Possible with Operational Amplifiers

• Operational amplifiers (op-amps) are versatile components configured in various circuits to perform different functions. These functions depend on the inputs and feedback connections.

• Inverting Amplifier:

  • Provides predictable gain determined by feedback and input resistors.
  • Output is 180° out of phase with the input.
  • Useful for amplification and signal conditioning.
  • Input signal connects to the inverting input (-).
  • Gain (Av) = -Rf/Rin

• Non-Inverting Amplifier:

  • Output is in phase with the input.
  • Higher input impedance than inverting amplifier.
  • Suitable for applications needing high input impedance.
  • Input signal connects to the non-inverting input (+).
  • Gain (Av) = 1 + (Rf/Rin)

• Summing Amplifier:

  • Adds multiple input signals to produce a single output.
  • Each input signal is weighted by its associated resistor.
  • Input signals connect to the inverting input (-).
  • Each input has a resistor (Rin1, Rin2...).
  • Output is the weighted sum of the inputs.

• Difference Amplifier:

  • Amplifies the difference between two input signals.
  • Provides a precise output for measuring small differences.
  • Two input signals, one to each input.
  • Requires balanced input resistor pairs for accuracy.
  • Allows for common mode rejection (suppressing common signals).

• Integrator Circuit:

  • Integrates the input signal over time.
  • Output is proportional to the area under the input signal's curve.
  • Inverting configuration with a capacitor in the feedback path.
  • Output is proportional to the integral of the input signal.

• Differentiator Circuit:

  • Generates an output proportional to the rate of change of the input signal.
  • Inverting configuration with a capacitor in the input path.
  • Output is proportional to the derivative of the input signal.

• Active Filters:

  • Op-amps are critical in active filter circuits.
  • Selectively amplify or attenuate specific frequency ranges.
  • Isolates desired signals from unwanted noise.
  • Includes high-pass, low-pass, band-pass, and band-stop filters.
  • Tunable parameters using component values.

• Instrumentation Amplifiers:

  • Specific op-amp configuration for increased input impedance and common-mode rejection ratio (CMRR).
  • Designed for measuring tiny voltage signals in noisy environments.
  • Crucial in sensors and instrumentation.

• Voltage Follower (Buffer Amplifier):

  • Provides high input impedance and low output impedance.
  • Acts as an intermediary stage to minimize loading on the preceding stage.
  • Output directly follows the input with a gain of 1.
  • Critical for isolating circuits.

• Current-to-Voltage Converter:

  • Converts a current input signal to a voltage output signal.
  • A resistor is placed in series with the input current.
  • Output voltage is proportional to the input current.

• Applications of Op-Amp Circuits:

  • Wide range of applications: active filters, sensors, instrumentation, signal conditioning, amplification, mathematical operations, industrial control systems.

Test your knowledge on various circuits that can be configured with operational amplifiers. This quiz covers inverting, non-inverting, and summing amplifiers, focusing on their functions and formulas. Challenge yourself to understand how these components are utilized in electronic applications.