In the common−base circuit shown in Figure P7.70, the transistor parameters are: β = 100 , V B E (on)=0 .7V , V A = ∞ , C π = 1 0pF , and C μ = 1 pF . (a) Determine the upper 3dB frequencies corresponding to the input and output portions of the equivalent circuit. (b) Calculate the small−signal midband voltage gain. (c) If a load capacitor C L = 15 pF is connected between the output and ground, determine if the upper 3dB frequency will be dominated by the C L load capacitor or by the transistor characteristics. Figure P7.70
In the common−base circuit shown in Figure P7.70, the transistor parameters are: β = 100 , V B E (on)=0 .7V , V A = ∞ , C π = 1 0pF , and C μ = 1 pF . (a) Determine the upper 3dB frequencies corresponding to the input and output portions of the equivalent circuit. (b) Calculate the small−signal midband voltage gain. (c) If a load capacitor C L = 15 pF is connected between the output and ground, determine if the upper 3dB frequency will be dominated by the C L load capacitor or by the transistor characteristics. Figure P7.70
In the common−base circuit shown in Figure P7.70, the transistor parameters are:
β
=
100
,
V
B
E
(on)=0
.7V
,
V
A
=
∞
,
C
π
=
1
0pF
, and
C
μ
=
1
pF
. (a) Determine the upper 3dB frequencies corresponding to the input and output portions of the equivalent circuit. (b) Calculate the small−signal midband voltage gain. (c) If a load capacitor
C
L
=
15
pF
is connected between the output and ground, determine if the upper 3dB frequency will be dominated by the
C
L
load capacitor or by the transistor characteristics.
Figure P7.70
(a)
Expert Solution
To determine
The upper 3dB frequencies corresponding to the input and output portions of the equivalent circuit.
1.Select the correct statement(s) regarding frequency modulation (FM) bandwidth.
a. the more the carrier frequency is allowed to change frequencies (Δf), the smaller the modulated signal bandwidth
b. the larger the FM index, β, the larger the modulated signal bandwidth
c. as you increase kvco, you decrease modulated signal bandwidth
d. all statements are correct
2. Select the correct statement(s) regarding baseband signal modulation.
a. with modulation, a baseband signal can be moved to a higher frequency thus preventing baseband signal interference
b. modulation techniques are only required for analog information signals, since digital signals are represented by discrete logical values of “1” and “0”
c. modulation eliminates the baseband signal’s frequency bandwidth, thus enabling greater efficiencies when transmitting a modulated carrier signal
d. all statements are correct
3. A…
19)This MCQ QUESTION FROM ANTENNA ENGINEERING course.
Identify how the excessive bandwidth use of FM can be overcome. (Check all that apply.)
By using narrowband FM with small deviation ratios
By using wideband FM with large deviation ratios
By operating in the ultrahigh frequency (UHF) region
By operating in the ultralow frequency (ULF) region
By operating in the microwave region
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.