## Transcribed Text

1) Fill in the table
Transistor �
�
I
1 1 0.1mA
2 0.2mA
3 3
4 3
5 3
6 10mA
V6 (Volts)
R6 Ohms 275
VDD (volts) +5V
VSS (Volts) -5V
Iref (amps)
�!�"# = 200� − 6 $
%! �&�"# = 150� − 6 $
%! �'! = �'& = 0.5�, V()
* = 10 %
+,
V(-
* = 8 %
+,
�,.! = 0.25��
2) This amplifier can be analyzed with the the small signal model shown. If L=Lmin, Iref=50µA, find:
gm1: __________
Rin __________
Rout: __________
Av0: __________
�!�"# = 200� − 6 $
%! �&�"# = 150� − 6 $
%! �'! = �'& = 0.5�, V()
* = 10 %
+,
V(-
* = 8 %
+,
�,.! = 0.25��
3) For this amplifier, find the largest differential input voltage which maintains the small signal
approximation (minimizing distortion) as well as the DC voltage at the Source VS, differential gain, and
Iref �!" = 0.25� �## = 8� �# = 100�Ω �$% = 1.05� &
' = 10
a) Max vid: _______
b) VS : _______
c) Ad: _______
d) IREF: _______
�!�"# = 200� − 6 $
%! �&�"# = 150� − 6 $
%! �'! = �'& = 0.5�, V()
* = 10 %
+,
V(-
* = 8 %
+,
�,.! = 0.25��
4) For this common-source amplifier biased and with blocking capacitors as you mind find a discrete
application such as lab, find the time constant and pole frequency associated with the gate, source and
drain as shown. Also find the voltages, currents etc. in the table.
�!�"# = 200� − 6 $
%! �&�"# = 150� − 6 $
%! �'! = �'& = 0.5�, V()
* = 10 %
+,
V(-
* = 8 %
+,
�,.! = 0.25��
Vov
ID 150 µA
Vgs
Vd
gm
�!"#
�!"#
�!"$
�!"$
�!%
�!%
5) The Miller effect allows a shortcut to understand the effective impedance seen on both sides
of a feedback amplifier. If Z is a 2MΩ impedance, and
K=-5000, find Z1 and Z2
Z1 :________
Z2 :________
�!�"# = 200� − 6 $
%! �&�"# = 150� − 6 $
%! �'! = �'& = 0.5�, V()
* = 10 %
+,
V(-
* = 8 %
+,
�,.! = 0.25��
�!�"# = 200� − 6 $
%! �&�"# = 150� − 6 $
%! �'! = �'& = 0.5�, V()
* = 10 %
+,
V(-
* = 8 %
+,
�,.! = 0.25��
6) For an amplifier with negative feedback, bandwidth can be increased for a decrease in gain. Ignoring
response below 100Hz (assume fL<<100Hz), and with a feedback factor of 0.05, open loop gain of 100k V/V
find
1) -3dB frequency (upper): _________
2) Midband gain: _________
3) -3dB frequency with feedback: _________
4) Midband gain with feedback: _________
5) Bandwidth with feedback: _________
�!�"# = 200� − 6 $
%! �&�"# = 150� − 6 $
%! �'! = �'& = 0.5�, V()
* = 10 %
+,
V(-
* = 8 %
+,
�,.! =
0.25��
7) If Vov=0.25V for all transistors, find
a) Vinmin: _________
b) Vinmax: _________
c) Voutmin: _________
d) Voutmin: ___

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