The diff-amp in Figure 11.19 is biased at I Q = 100 μ A . The transistor parameters are k n ′ = 100 μ A / V 2 and W / L = 10. (a) If the output resistance of the current source is R o = 1 M Ω , determine the common-mode rejection ratio CMRR dB . (b) Determine the required value of R o such that CMRR dB = 80 dB . (Ans. (a) CMRR dB = 50 dB , (b) R o = 31.6 M Ω ).
The diff-amp in Figure 11.19 is biased at I Q = 100 μ A . The transistor parameters are k n ′ = 100 μ A / V 2 and W / L = 10. (a) If the output resistance of the current source is R o = 1 M Ω , determine the common-mode rejection ratio CMRR dB . (b) Determine the required value of R o such that CMRR dB = 80 dB . (Ans. (a) CMRR dB = 50 dB , (b) R o = 31.6 M Ω ).
Solution Summary: The author explains the common-mode rejection ratio CMMR in dB.
The diff-amp in Figure 11.19 is biased at
I
Q
=
100
μ
A
.
The transistor parameters are
k
n
′
=
100
μ
A
/
V
2
and
W
/
L
=
10.
(a) If the output resistance of the current source is
R
o
=
1
M
Ω
,
determine the common-mode rejection ratio CMRR
dB
. (b) Determine the required value of
R
o
such that
CMRR
dB
=
80
dB
. (Ans. (a) CMRR
dB
=
50
dB
,
(b)
R
o
=
31.6
M
Ω
).
Refer to the differential amplifier circuit shown below .
Determine the quiescent DC voltage at the collector terminal of each transistor assuming VBE of two transistor are negligible.
What will be the quiescent DC values if VBE is taken to be 0.7 V.
Topic: Field Effect Transistor
Given the FET Amplifier circuit. Answer the question asked in each letter.
a. Transconductance Gain (gm)
b. Drain Resistor (RD)
c. Input Impedance (Zi)
d. Output Impedance (Zo)
e. Voltage Gain (Av)
f. What is the AC configuration of the amplifier?common source, common gate, common drain, or source bias?
In the circuit given in the figure, Vcc = 15 V, R1 = R2 = 10kΩ, RE = 1KΩ, RL = 0.5kΩ and transistor parameters are given as VBE = 0.7V, ßdc = ß0 = 100.
a. Calculate the values of DC bias currents and voltages (IBQ, ICQ and VCEQ).
b. Draw the small signal equivalent circuit of the circuit using the hybrid model of the transistor.
c. Derive the input impedance expression of the circuit and calculate its value.
d. Derive the AVI and AVG voltage gain expressions and calculate their values.
e. Derive the current gain expression AI = I0 / Ii and calculate its value. Compare this value you have calculated with the value you will calculate using the expression Aİ = Zi AVI / RL.
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