A carrier of amplitude 1 mv is 50% amplitude modulated by a sinusoidal waveform of frequency fx < 1000 Hz. The signal is accompanied by thermal noise of two-sided spectral density n/2 = 10-¹2 watt/Hz. The signal plus noise is passed through a predetection filter having the response shown in Figure 7.19. The signal is demodulated by multi- plication with a local carrier of amplitude 2 volts and filtering the product with an ideal lowpass filter having a bandwidth of 1 kHz. (a) Find the output signal power. (b) Find the output noise power. (c) Find (S/N) at the demodulator input and (S/N)d.

A carrier of amplitude 1 mv is 50% amplitude modulated by a sinusoidal waveform of frequency fx < 1000 Hz. The signal is accompanied by thermal noise of two-sided spectral density n/2 = 10-¹2 watt/Hz. The signal plus noise is passed through a predetection filter having the response shown in Figure 7.19. The signal is demodulated by multi- plication with a local carrier of amplitude 2 volts and filtering the product with an ideal lowpass filter having a bandwidth of 1 kHz. (a) Find the output signal power. (b) Find the output noise power. (c) Find (S/N) at the demodulator input and (S/N)d.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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