Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN: 9780133923605
Author: Robert L. Boylestad
Publisher: PEARSON
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Subject:communication
m(1)
A block diagram of an indirect (Armstrong) frequency modulation (FM) transmitter is
shown in below. Let fi=100KHz, and the frequency deviation Afi=10HZ at the input of this
indirect transmitter, and the local frequency is fio-8.5MHz. Evaluate ni and n2 to obtain a
carrier frequency fe=100MHz and Af=75KHz at the output of this indirect FM modulator.
Note that NBFM and LPF mean narrow-band FM and low-pass filter, respectively.
NBFM
f,
Af₁
Frequency
multiplier
X n₁
f2
A/₂
fio
LPF
13
4/₂
Frequency
multiplier
X n₂
x (1)
Af
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Transcribed Image Text:m(1) A block diagram of an indirect (Armstrong) frequency modulation (FM) transmitter is shown in below. Let fi=100KHz, and the frequency deviation Afi=10HZ at the input of this indirect transmitter, and the local frequency is fio-8.5MHz. Evaluate ni and n2 to obtain a carrier frequency fe=100MHz and Af=75KHz at the output of this indirect FM modulator. Note that NBFM and LPF mean narrow-band FM and low-pass filter, respectively. NBFM f, Af₁ Frequency multiplier X n₁ f2 A/₂ fio LPF 13 4/₂ Frequency multiplier X n₂ x (1) Af
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