Using Negative Feedback to Build Amplifiers

These flashcards cover key concepts related to operational amplifiers and negative feedback, essential for understanding Chapter 13 from the lecture notes.

Negative Feedback

A ubiquitous technique in engineering that allows stability in a system despite fluctuations by counteracting changes.

Op-Amp

Short for Operational Amplifier, it acts as a voltage-controlled voltage source where the output voltage depends on the input voltage.

Inverting Comparator

A comparator that outputs 'low' when the input is above the reference and 'high' when below the reference.

Non-Inverting Comparator

A comparator that outputs 'high' when the input is above the reference and 'low' when below the reference.

Closed-Loop Gain

The gain of the op-amp that can be designed by the engineer, it is external to the op-amp and much more useful than open-loop gain.

Open-Loop Gain

The internal gain of the op-amp that is fixed and cannot be changed.

Virtual Open Circuit Assumption

A rule for amplifiers that states no current flows into the input terminals of the op-amp.

Virtual Short Circuit Assumption

A rule that states that the two input voltages of the op-amp are equal, resulting in a differential input voltage of zero.

Inverting Amplifier

An op-amp circuit where the noninverting input is grounded and the inverting terminal connects to output through a feedback resistor.

Feedback Resistor (Rf)

A resistor used in feedback to control the gain of an op-amp circuit.