EE281 - Electric Circuits

OPAMPs

Typical Values

Typical Values Ideal Values
A (Open-loop gain) \(10^5-10^8\; \Omega\) \(\infty\)
Rin (Input Resistance) \(10^5-10^{13}\; \Omega\) \(\infty\)
Rout (Output Resistance) \(10-100\; \Omega\) \(0\)

Example:

Find vo in the circuit.

Inverting Amplifier

Non-inverting Amplifier

Ex:

Vo=7V

Summing Amplifier

Ex: Vo=-8V io=-4.8mA

Difference Amplifier

Ex: Design an op amp circuit with inputs v 1 and v 2 such that Vo = 3V2 - 5V1

Cascaded OPAMPS

V0=3.5 V Ex: V1=7V V2=3.1 V

Vo=? Vo=10V