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a) 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 flo=8.5MHz. Evaluate ni and n2 to obtain a carrier frequency fe-100MHz and Af=75KHz at the output of this indirect FM modulator. x₂ (1) m(1) Frequency multiplier LPF NBFM Frequency multiplier x ₁ X n₂ f₁ A/₁ f₂ D/₂ fLO f3 Af

a) 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 flo=8.5MHz. Evaluate ni and n2 to obtain a carrier frequency fe-100MHz and Af=75KHz at the output of this indirect FM modulator. x₂ (1) m(1) Frequency multiplier LPF NBFM Frequency multiplier x ₁ X n₂ f₁ A/₁ f₂ D/₂ fLO f3 Af

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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a) 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 flo=8.5MHz. Evaluate ni and n₂ to obtain a carrier frequency fe=100MHz and Af=75KHz at the output of this indirect FM modulator. m(1) x (1) NBFM Frequency multiplier LPF Frequency multiplier X n₁ x 7₂ f₁ f₂ f3 fc A/₁ Af₂ Af₁ Af ~ LO b) Draw the block diagram of the balanced discriminator circuit that can be used to demodulate wideband FM (WBFM) signals. Explain briefly the operation of this circuit and sketch clearly the overall frequency-to-voltage characteristic.
Transcribed Image Text:a) 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 flo=8.5MHz. Evaluate ni and n₂ to obtain a carrier frequency fe=100MHz and Af=75KHz at the output of this indirect FM modulator. m(1) x (1) NBFM Frequency multiplier LPF Frequency multiplier X n₁ x 7₂ f₁ f₂ f3 fc A/₁ Af₂ Af₁ Af ~ LO b) Draw the block diagram of the balanced discriminator circuit that can be used to demodulate wideband FM (WBFM) signals. Explain briefly the operation of this circuit and sketch clearly the overall frequency-to-voltage characteristic.
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