MIE346H1S 2019 ANALOG DIGITALELECTRONICS...
MIE346H1S_2019_ANALOG_DIGITALELECTRONICS_E.pdf-University of Toronto Faculty of Applied
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MIE346H1S 2019 ANALOG DIGITALELECTR...
MIE346H1S_2019_ANALOG_DIGITALELECTRONICS_E.pdf-University of Toronto Faculty of Applied
##### Page 4
Student Number:
Last Name:
Question 2(a)
-
Consider the circuit
shown below,
which is part of an H-bridge motor driver
-
a circuit that switches a
motor on and off for speed/direction control. In this case, the motor being driven expects 12
V
across its terminals in order
to yield peak mechanical output. The motor load is represented in the circuit by the fixed resistor,
Vdd
Vdd
ni
RGI
VIN
RDI
¼JL
(
~WLL
)
=
3.12
MA/V2
=
2.5
V
Q2
TDSON
=
5.025 fl
For
Q2:
(
W)=230.4rnA/V
2
L
2
V
2
=
-
4V
rDsON
=
1.75 fl
12
V
=
2 fl
RD
1
=
1
Kfl
RG
1
=
ion
RG
2
Solve the circuit by finding all voltages and currents listed on the following page, as well as the operating modes of both
transistors. Assume that
17!N
=
5
V,
an input level which should correspond to an output state where the motor is
running/operating at maximum mechanical output. Indicate if you think the circuit has been design correctly for its intended
application, briefly explaining why or why not based on your calculations.
Page 4/11

Student Number:
Last Name:
ID,
'D2
VD S,
=
=
Qi Mode
Q2 Mode
Page s/li
/
201

##### Page 6
Student Number:
Last Name:
Question
2(b)
-
Consider the
partially
complete MOSFET
amplifier circuit shown
below. Ignore r
0
in all calculations.
Given:
V
DD
=l2V
k'
('=10mA/V2
RD
fl
)
FID
U
V..=2.5V
VOW
(a) Draw in an appropriate
biasing arrangement
in the highlighted space on the
circuit
diagram
;
in order to create a
small-
signal amplifier with
these
parameters:
RIN
=
100
Kfl
R0ur 4
Kf1
A
0
=
—12.5
V/V
consist of
up to
two
resistors
(R
1
and
R
2
).
All resistors used must connect to
the MOSFET
gate with
one
terminal,
but
may
connect to
any
other place in the
circuit with their
second
terminal (including
VDD
and
ground). Given your
completed
circuit,
solve
for
all
unknown
resistor values,
including
RD,. R
5
,
and any
Page 6/11

Student Number:
Last Name:
/25].
Page 7/11
R
1
=
R2
=
(If used)
R=
RD=

##### Page 8
Student Number:
Last Name:
Question 3(a)
-
Consider the BJT amplifier circuit shown below. Include the Early effect
in
Vcc
Vcc
VIN
fl
=
100
VCESAT
=
1.0
V
VA
=50
V
F
c
VOLIT
R
1
=
100
Kfl
R
2
=
100 K1
RE
=
5 Kfl
VCC
=
10V
Find the value of the small-signal parameters
A
0
and
ROUT
for the above amplifier.
Page 8/11

Student Number:
Last Name:
RoUT=
Page 9/11
/251

##### Page 10
Student Number:
Last Name:
(b) You later connect a second amplifier stage ('New Circuit') to the input of the circuit from Part A ('Circuit A'). Your goal in
doing so is to create a two-stage amplifier with the overall properties listed below:
New Circuit
Circuit A
RIN (Total)E
*r
H
ROUT (Total)
RIN (Total)
~! 200
Kf1
R0 (Total)
!~ 32 fl
IAvoI
(Total)
30
v/v
Based on standard results, what type of one-transistor
MOSFET
or BJT amplifier would you select for the new circuit and
why? Justify your response in 2-3 sentences.
/51
Page 10/11

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