The parameters in the circuit shown in Figure 7.15 are R S = 100 Ω , r π = 2.4 kΩ , g m = 50 mA/V , R L = 10 kΩ , C C = 5 μF ,and C L = 4 pF .(a)Findtheopen-circuit and short-circuit time constants. (b) Calculate the midband voltage gain.(c) Determine the lower and upper 3 dB frequencies. (Ans. (a) τ S = 12.5 ms , τ P = 0.04 μ s ; (b) A υ = − 480 ; (c) f L = 12.7 Hz , f H = 3.98 MHz ) Figure 7.15 Figure for Exercise TYU 7.3
The parameters in the circuit shown in Figure 7.15 are R S = 100 Ω , r π = 2.4 kΩ , g m = 50 mA/V , R L = 10 kΩ , C C = 5 μF ,and C L = 4 pF .(a)Findtheopen-circuit and short-circuit time constants. (b) Calculate the midband voltage gain.(c) Determine the lower and upper 3 dB frequencies. (Ans. (a) τ S = 12.5 ms , τ P = 0.04 μ s ; (b) A υ = − 480 ; (c) f L = 12.7 Hz , f H = 3.98 MHz ) Figure 7.15 Figure for Exercise TYU 7.3
Solution Summary: The open circuit and short circuit time constants are shown.
The parameters in the circuit shown in Figure 7.15 are
R
S
=
100
Ω
,
r
π
=
2.4
kΩ
,
g
m
=
50
mA/V
,
R
L
=
10
kΩ
,
C
C
=
5
μF
,and
C
L
=
4
pF
.(a)Findtheopen-circuit and short-circuit time constants. (b) Calculate the midband voltage gain.(c) Determine the lower and upper 3 dB frequencies. (Ans. (a)
τ
S
=
12.5
ms
,
τ
P
=
0.04
μ
s
; (b)
A
υ
=
−
480
; (c)
f
L
=
12.7
Hz
,
f
H
=
3.98
MHz
)
a.) Unmodulated frequency. b.) Modulated frequency. c.) Upper and lower sideband frequencies.
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…
Explain the derivation behind the encircled part of the image. Thank you.
TOPIC: BIPOLAR AMPLIFIERS
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.