Basic Op-Amp Configurations

This part of the class explains the negative feedback in op-amp circuits and how to compute basic parameters for the basic op-amp configurations. You will learn how to:

• Analyze three op-amp configurations including inverting and non-inverting amplifiers, and voltage followers
• Describe impedances of these basic op-amp configurations
• Troubleshoot op-amp circuits.

Key Concepts

• Op-amp configurations with negative feedback
• Op-amp impedances
• Troubleshooting op-amp amplifiers
• Non-inverting amplifiers
• Inverting amplifiers
• Voltage followers
• Closed-loop voltage gain
• The non-inverting amplifier has a minimum voltage gain of unity.
• An inverting amplifier can provide gain or attenuate the output.
• The output of an inverting amplifier is 180° out of phase with the input.
• A voltage follower always has a gain of 1.
• All op-amps have designed input and output impedances.
• The use of negative feedback has a major impact on the input and output impedance that can be far different than the design parameters.

Op-amps can be connected in closed-loop or open-loop configurations.