For the circuit in Figure 7.72, the transistor parameters are: V T N = 1 V , K n = 1 mA/V 2 , λ = 0 , C g d = 0.4 pF , and C g s = 5 pF . Perform a computersimulation to determine the upper 3 dB frequency and the midband small−signalvoltage gain. (Ans. f H = 64.5 MHz , | A υ | = 0.127 )
For the circuit in Figure 7.72, the transistor parameters are: V T N = 1 V , K n = 1 mA/V 2 , λ = 0 , C g d = 0.4 pF , and C g s = 5 pF . Perform a computersimulation to determine the upper 3 dB frequency and the midband small−signalvoltage gain. (Ans. f H = 64.5 MHz , | A υ | = 0.127 )
Solution Summary: The author explains that the value for all the capacitors in the diagram is bypassed while constructing the figure in PSPICE software.
For the circuit in Figure 7.72, the transistor parameters are:
V
T
N
=
1
V
,
K
n
=
1
mA/V
2
,
λ
=
0
,
C
g
d
=
0.4
pF
, and
C
g
s
=
5
pF
. Perform a computersimulation to determine the upper 3 dB frequency and the midband small−signalvoltage gain. (Ans.
f
H
=
64.5
MHz
,
|
A
υ
|
=
0.127
)
Q7. Figure Q7(a) shows the spectrum of a frequency modulated waveform with a sinusoidal
modulation.
12
4.8
5.0
5.2
5.4
5.6
5.8
6.0
Frequency/MHz
Figure Q7: (a) Spectrum of a frequency modulated waveform with a sinusoidal modulation.
(a) Is this modulated waveform described as narrowband or as wideband?
(b) What is the value of the carrier frequency?
(c) What is the value of the modulation frequency?
(d) Determine the value of the peak frequency deviation. Plots of Bessel functions of the
first kind are provided below in Figure Q7(b) to assist you.
(e) Estimate the fraction of the total signal power at the carrier frequency.
(f) Detection of such a frequency modulated signal is usually accomplished with the use
of a discriminator. Describe the function of a discriminator.
(g) What is the equivalent AM modulation index obtained if this signal in Figure Q7(a) is
demodulated with a high-pass RC filter discriminator?
J„(x)
1.0
0.8
0.6
0.4
0.2
-0.2
-0.4
Figure Q7: (b) Bessel functions of the…
TYU 7.1 For the equivalent circuit shown in Figure 7.13, the parameters are:
Rs = 1 k2, r, = 2 k2, RL = 4 k2, gm = 50 mA/V, and Cc 1 µF. (a) Determine
the expression for the circuit time constant. (b) Calculate the 3 dB frequency and
maximum gain asymptote. (c) Sketch the Bode plot of the transfer function magni-
tude. (Ans. (a) t = (r+ Rs)Cc. (b) fsaB 53.1 Hz, [T (jo)Imax = 133)
%3D
%3D
Rs
Ce
ww
RL
8mVR
Figure 7.13 Figure for Exercise TYU 7.1
7.65 In the circuit in Figure P7.65, the transistor parameters are: B 120,
Ver(on)=0.7 V, VA 100 V, C -I pF, and fr
mine C, and the equivalent Miller capacitance Cy. State any approxima-
tions or assumptions that you make. (b) Find the upper 3 dB frequency and
the midband voltage gain.
-600 MHz. (a) Deter-
+5 V
R= 33 ka
wwHH
Ry=22 k2
4 k2
10
ww
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