Lecture 6.1-Operational Amplifier (1)

What is an operational amplifier (op-amp)?

A very high gain differential amplifier with high input impedance and low output impedance.

What are the two types of configurations for op-amps?

Open-loop and closed-loop configurations.

What is the gain in an open-loop configuration of an op-amp?

The gain can exceed 10,000.

What effect does negative feedback have on an op-amp?

It reduces gain and improves many characteristics of the op-amp.

What are the two inputs to an op-amp called?

Inverting input and non-inverting input.

In an inverting amplifier, where is the signal input applied?

To the inverting (-) input.

What is the relationship between the feedback resistor Rf and R1 in an inverting amplifier?

Gain can be determined as Av = -Rf/R1.

What does the negative sign in inverting amplifier gain formula indicate?

A 180° phase shift between the input and output.

What is the output voltage equation for a non-inverting amplifier?

Vo = (1 + Rf/R1)V1.

What is the purpose of a unity follower circuit?

To provide a gain of unity (1) with no polarity or phase reversal.

What is the function of a summing amplifier?

It combines multiple input voltages into a single output.

What is the output equation for an integrator circuit?

vo(t) = -1 ∫v1(t)dt.

What is the purpose of a differentiator circuit?

To take the derivative of the input signal.