Op-Amp Labs

2001

Common Types of Op-Amps

• Singe-Ended vs Double-Ended (Balanced-Input, Balanced Output)
• Single Power Supply vs Dual-Power Supply
• Signal I/O vs Audio-I/O (below RF)
• Power Audio
• Power RF

Feedback Design

Full Negative Feedback results in an interesting situation.

• It has, as a result, a 1:1 Amplification. The Input Impedance is extremely high, and the Output Impedance is very low,
• making this a veritable "Buffer" for desired use, and normally can handle high frequency bandwidth.

Controlled Negative Feedback

• Used for controlling the desired "Gain Figure" (As in "Amplification")
• Another use is to control "Dampening" undesired Inputs
• A "Filter" can be incorporated to "Dampen" a specific range of frequencies

Controlled "Positive Feedback

• A "Filter" incorporated here can "Enhance" a specific range of frequencies
• A "High-Q" Filter can be used to create Oscillation at a specific frequency
• By allowing a high-gain to prevail, the output will be a square-wave of any input.