ELCT 371: Spring 2011
Homework #1 (based on Chapter 1)
Due: Feb 3, 2011 (in class)
Topics covered: General amplifier properties, cascaded amplifiers, efficiency, decibel
gain, amplifier models, CMRR
1. A signal source with an open-circuit voltage of Vs =

ELCT 371: Spring 2011
Homework #2 (based on Chapter 2)
Topics covered: Inverting and non-inverting op-amps, summing point constraint, Gain
vs. frequency, op-amp limitations.
Due: February 22, 2011 (in class)
1. Each of the circuits shown in Figure P2.10 e

ELCT 371: Spring 2011
Homework #3 (based on Chapters 2 and 3)
Topics covered: Op-amp limitations, Diode properties, diode circuits, rectifiers, diode dynamic
resistance.
Due: March 22 (in class)
1. A certain op amp has a maximum output voltage range from

ELCT 371: Spring 2011
Homework #4 (based on Chapters 3 and 4)
Due: April 7, 2011 in class
1. A certain diode gas Is = 10-14 A, and n = 1. Assume that Vt = 26 mV.
(a) Determine the dynamic resistance if the forward current is 1 mA.
(b) Use the dynamic resi

ELCT 371: Spring 2011
Homework #1 solution
Problem 1
50K
2 mV
4 Ohm
200K
Av =
100 Vi
4 Ohm
Vo
RL
= Avo
= 50
Vi
RL + RO
Avs =
Vo
Ri
RL
200 K
= Avo
= 50 *
= 40
Vs
RL + RO Ri + Rs
250 K
Ai = Av
Ri
= 50 * 200 *103 / 4 = 2.5 *106
RL
G = AvAi = 1.25 108
Problem

ELCT 371: Spring 2011
Homework #2 Solution (based on Chapters 2)
Topics covered: Inverting and non-inverting op-amps, summing point constraint, Gain vs. frequency,
op-amp limitations.
1. Each of the circuits shown in Figure P2.10 employs negative feedback

ELCT 371: Spring 2011
Homework #3 Solution (based on Chapter 2 and 3)
1. A certain op amp has a maximum output voltage rande from -10V to +10V. The
output can source or sink a maximum current of 20mA. The slew-rate limit is SR =
10V/us. This op amp is use