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Ex 4-3: A transmitter transmits an AM/DSB single tone-modulating signal given by 3 cos(2n10°t)volt with a carrier signal given by 10 cos(210°t)volt Find: 1- Modulation depth. 2- USB & LSB frequencies. 3- Amplitude of sideband frequencies.

Ex 4-3: A transmitter transmits an AM/DSB single tone-modulating signal given by 3 cos(2n10°t)volt with a carrier signal given by 10 cos(210°t)volt Find: 1- Modulation depth. 2- USB & LSB frequencies. 3- Amplitude of sideband frequencies.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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Ex 4-3: A transmitter transmits an AM/DSB single tone-modulating signal given by 3 cos(2n10°t)volt with a carrier signal given by 10 cos(2r10°t)volt ,Find: 1- Modulation depth. 2- USB & LSB frequencies. 3. Amplitude of sideband frequencies. 4- Efficiency of Transmission. 83 (CH 4) Amplitude Modulation By Dr. Hikmat Al-Shamary & Dr. Tariq M. Salman Solution: Am-3 v, A.=10 v fm =103 Hz, fe=106 Hz 1- D = Am x 100% = x 100% = 30% 10 2- USB frequency is f. + fm = 10ó + 10° = 1.001 MHz, LSB frequency is f. - fm = 10° - 10 = (1.999 MHz 0.3x10 3- Amp. of USB & LSB is - 0.75 volt 4- 7 = 0.3 = 4.3 % m2+2 0.32 +2 H.W: Repeat the previous example assuming that the modulating signal is given by: S(xt) = {t-1, 0<t<2+103 2+ 10-3 <t< 4+ 10- 0, Assume that the signal is band-limited to 1 kHz.
Transcribed Image Text:Ex 4-3: A transmitter transmits an AM/DSB single tone-modulating signal given by 3 cos(2n10°t)volt with a carrier signal given by 10 cos(2r10°t)volt ,Find: 1- Modulation depth. 2- USB & LSB frequencies. 3. Amplitude of sideband frequencies. 4- Efficiency of Transmission. 83 (CH 4) Amplitude Modulation By Dr. Hikmat Al-Shamary & Dr. Tariq M. Salman Solution: Am-3 v, A.=10 v fm =103 Hz, fe=106 Hz 1- D = Am x 100% = x 100% = 30% 10 2- USB frequency is f. + fm = 10ó + 10° = 1.001 MHz, LSB frequency is f. - fm = 10° - 10 = (1.999 MHz 0.3x10 3- Amp. of USB & LSB is - 0.75 volt 4- 7 = 0.3 = 4.3 % m2+2 0.32 +2 H.W: Repeat the previous example assuming that the modulating signal is given by: S(xt) = {t-1, 0<t<2+103 2+ 10-3 <t< 4+ 10- 0, Assume that the signal is band-limited to 1 kHz.
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