Part 1. Review of Commonly Used Voltage Amplifier Circuits

Question 1. For the op amp circuit shown in Fig. 1, write the general formula for the voltage gain Av

with units of volts-per-volt (V/V), and expressed in terms of resistors R1 and R2.

Answer 1. (5 points) Av=

R2

Vin un

R₁

U1

-Vout

Fig. 1. Closed loop feedback amplifier circuit.¹