The University of Portland
School of Engineering
EE352
Electronic Circuits II
HOMEWORK 1
Assigned: Mon, Jan 12, 2009
Due: Wed, Jan 21, 2009
Problems:
1. Consider the BJT Diff Amp with Passive Load on the next page. Consider
that this Diff Amp is to be used in the “single-ended” output mode (SEOM)
with the output at V
C2
. Determine the SEOM differential configuration
parameters: A
d
, R
id
and R
od
. Determine the SEOM common-mode
configuration parameters: A
cm
, R
icm
and R
ocm
. Calculate the CMRR.
Assume I=20µA, R=10MΩ, R
C
=100kΩ, β=100, +V
CC
=+5V and −V
EE
=−5V.
2. Using PSPICE, verify all your hand-calculations in Problem 1, above. You
will need to run PSPICE Transfer Analysis twice: (1) with your circuit
configured in the SEOM differential configuration and, (2) with your circuit
configured in the SEOM common-mode configuration. In PSPICE, use
QbreakN3 and edit its model such that BF=100. Use a simple VDC
voltage source (name it VIN) set to 0V at the input for each case (i.e.,
First, for the SEOM differential configuration simulation, connect V
B1
to
VIN=0V and V
B2
to GND_EARTH. Then, second, for the SEOM common-
mode configuration simulation, connect both V
B1
and V
B2
together and to
VIN=0V). Use Transfer Function Analysis and set Bias Point Details on
for both cases. You will then be able to simply read your two xxx.out
PSPICE files to get A
d
, R
id
and R
od
for the SEOM differential configuration
and A
cm
, R
icm
and R
ocm
for the SEOM common-mode configuration,
respectively. Please hand-in both your labeled PSPICE schematics and
both your edit’ed and labeled PSPICE xxx.out files.
