Calculate the following parameters for a Phase Modulator which has a carrier frequency of 10 kHz...
- Calculate the following parameters for a Phase Modulator which has a carrier frequency of 10 kHz and a modulating data rate of 3 kHz:
- Modulating data time period:
- Baud rate:
- Upper sideband:
- Lower sideband:
- Bandwidth:
- Use the Labview circuit to verify the calculations Explain any observations and discrepancies.
- Use Labview to build a Phase Modulator. The sinusoidal carrier signal should be adjustable up to 12 kHz and the amplitude adjustable to 5 volts, using a “simulate signal” express vi.
- The modulating input should be a simulate signal vi configured as a square wave in order to provide digital modulating data. The square wave frequency should be adjustable to 5000 Hz and its amplitude adjustable to 5 volts.
Homework Answers
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Calculate the following parameters for a Phase
Modulator which has a carrier frequency of 10 kHz...
The sinusoidal modulating wave is applied to a phase modulator with phase sensitivity kp. The unmodulated carrier wave has frequency fc and amplitude Ac. a) Determine the spectrum of the resulting ph...
The sinusoidal modulating wave is applied to a phase modulator with phase sensitivity kp. The unmodulated carrier wave has frequency fc and amplitude Ac. a) Determine the spectrum of the resulting phase-modulated signal, assuming that the maximum phase deviationP4es not exceed 0.3 radians. b) Construct a phasor diagram for this modulated signal, and compare it with that of the corresponding narrow-band FM signal.
The sinusoidal modulating wave is applied to a phase modulator with phase sensitivity kp. The unmodulated carrier...
2. A 3 KHz sinusoidal signal Phase Modulates a carrier at 245.3 MHz. The modulating tone...
2. A 3 KHz sinusoidal signal Phase Modulates a carrier at 245.3 MHz. The modulating tone has an amplitude of 4 volts and the phase sensitivity of the modulator is 0.5 radians/volt. a. (15 points) Evaluate the required transmission bandwidth using Carson's Rule. b. (15 points) If the resulting PM signal is passed through an IBPF with bandwidth given by Carson's Rule (plus a few Hz), what percentage of the signal power is lost?
12. An FM signal has a deviation of 3 kHz and a modulating frequency of 1...
12. An FM signal has a deviation of 3 kHz and a modulating frequency of 1 kHz. Its total power Pris 5 W, developed across a 50 2 resistive load. The carrier frequency is 160 MHz (a) Calculate the RMS signal voltage VI (b) Calculate the RMS voltage at the carrier frequency and each of the first three sets of sidebands. (c) For the first three sideband pairs, calculate the frequency of each sideband. (d) Calculate the power at the...
14. Given a sinusoidal modulating signal with frequencies f," 10 kHz and a carrier signal of...
14. Given a sinusoidal modulating signal with frequencies f," 10 kHz and a carrier signal of 100 MHz, determine the bandwidth of FM for the three cases (amplitudes: 1. 10, 100, 1000) when the maximum frequency deviation is 50 kHz and k,-2? × 100 rad/sec/volt.
1 2 4. The amplitude modulation signal is given by the following expression and is applied...
1
2
4. The amplitude modulation signal is given by the following expression and is applied to 75 load. Vam(t) = 10 sin (21fct) - 2.5 cos (1500krt) + 2.5 cos (1450krt) V Determine: a) Modulation index b) The frequency of the carrier and the information signal c) The bandwidth d) The total power e) The transmission power efficiency be ar e 5. One of the inputs to a frequency modulator is a 250 kHz carrier signal with amplitude of...
a. In FM transmission circuits, explain the purpose and function of: i. Pre-emphasis and de-emphasis circuits....
a. In FM transmission circuits, explain the purpose and function of: i. Pre-emphasis and de-emphasis circuits. (CO1: PO1 - 3 Marks) ii. Limiter circuit. (CO1: P01 - 3 Marks) b. A sinusoidal carrier wave of frequency fe = 110 MHz is modulated by a modulating signal m(t). The characteristics of the modulating signal is illustrated in Figure Q2(b) and the Frequency Deviation Constant of the FM Modulator, kf = 107 Hz/volt. Determine the minimum bandwidth required for transmission of the...
question 2 Question 2: (10 points) A narrowband signal has a bandwidth of 8 kHz centered on a carrier frequency of 150 kHz. It is proposed to represent this signal in discrete-time form by samplin...
question 2
Question 2: (10 points) A narrowband signal has a bandwidth of 8 kHz centered on a carrier frequency of 150 kHz. It is proposed to represent this signal in discrete-time form by sampling its in-phase and quadr ature components individually. What is the minimum sampling rate that can be used for this representation? tify you Jus answer. How would you reconstruct the original narrowband sig ampled versions of its in-phase and quadrature components?
Question 2: (10 points) A...
2. Question: A baseband signal has a bandwidth B = 10 kHz. The carrier frequency is...
2. Question: A baseband signal has a bandwidth B = 10 kHz. The carrier frequency is ae = 2x 106 f the DSB-SC signal. T. Find the Nyquist frequency and Nyquist interval 0 of
10. Answer the following questions: 10.1 What characteristic of the carrier wave is changed to represent...
10. Answer the following questions: 10.1 What characteristic of the carrier wave is changed to represent the data in ASK? a. amplitude b. frequency c. phase d. period 10.2 What kind of keying or modulation changes both the amplitude and phase of a carrier wave to represent data? a. FM 6. FSK c. PSK d. QAM 10.3 PSK is keying, not analog modulation. a. true b. false 11. Match. Data is the original information and signal is the information as...
5. Consider the following message signal: -2 Assume that the carrier frequency is f are kr 105, k...
5. Consider the following message signal: -2 Assume that the carrier frequency is f are kr 105, kp 25 respectively. 108 Hz, and frequency and phase deviation constants Find the maximum and minimum frequency deviation for FM, and sketch the FM wave for a duration of 103 seconds shown in the above figure (5 points). a. b. Find the maximum and minimum frequency deviation for PM, sketch the PM wave for a duration of 103 seconds shown in the above...
The sinusoidal modulating wave is applied to a phase modulator with phase sensitivity kp. The unmodulated carrier wave has frequency fc and amplitude Ac. a) Determine the spectrum of the resulting phase-modulated signal, assuming that the maximum phase deviationP4es not exceed 0.3 radians. b) Construct a phasor diagram for this modulated signal, and compare it with that of the corresponding narrow-band FM signal.
The sinusoidal modulating wave is applied to a phase modulator with phase sensitivity kp. The unmodulated carrier...
2. A 3 KHz sinusoidal signal Phase Modulates a carrier at 245.3 MHz. The modulating tone has an amplitude of 4 volts and the phase sensitivity of the modulator is 0.5 radians/volt. a. (15 points) Evaluate the required transmission bandwidth using Carson's Rule. b. (15 points) If the resulting PM signal is passed through an IBPF with bandwidth given by Carson's Rule (plus a few Hz), what percentage of the signal power is lost?
12. An FM signal has a deviation of 3 kHz and a modulating frequency of 1 kHz. Its total power Pris 5 W, developed across a 50 2 resistive load. The carrier frequency is 160 MHz (a) Calculate the RMS signal voltage VI (b) Calculate the RMS voltage at the carrier frequency and each of the first three sets of sidebands. (c) For the first three sideband pairs, calculate the frequency of each sideband. (d) Calculate the power at the...
14. Given a sinusoidal modulating signal with frequencies f," 10 kHz and a carrier signal of 100 MHz, determine the bandwidth of FM for the three cases (amplitudes: 1. 10, 100, 1000) when the maximum frequency deviation is 50 kHz and k,-2? × 100 rad/sec/volt.
1
2
4. The amplitude modulation signal is given by the following expression and is applied to 75 load. Vam(t) = 10 sin (21fct) - 2.5 cos (1500krt) + 2.5 cos (1450krt) V Determine: a) Modulation index b) The frequency of the carrier and the information signal c) The bandwidth d) The total power e) The transmission power efficiency be ar e 5. One of the inputs to a frequency modulator is a 250 kHz carrier signal with amplitude of...
a. In FM transmission circuits, explain the purpose and function of: i. Pre-emphasis and de-emphasis circuits. (CO1: PO1 - 3 Marks) ii. Limiter circuit. (CO1: P01 - 3 Marks) b. A sinusoidal carrier wave of frequency fe = 110 MHz is modulated by a modulating signal m(t). The characteristics of the modulating signal is illustrated in Figure Q2(b) and the Frequency Deviation Constant of the FM Modulator, kf = 107 Hz/volt. Determine the minimum bandwidth required for transmission of the...
question 2
Question 2: (10 points) A narrowband signal has a bandwidth of 8 kHz centered on a carrier frequency of 150 kHz. It is proposed to represent this signal in discrete-time form by sampling its in-phase and quadr ature components individually. What is the minimum sampling rate that can be used for this representation? tify you Jus answer. How would you reconstruct the original narrowband sig ampled versions of its in-phase and quadrature components?
Question 2: (10 points) A...
2. Question: A baseband signal has a bandwidth B = 10 kHz. The carrier frequency is ae = 2x 106 f the DSB-SC signal. T. Find the Nyquist frequency and Nyquist interval 0 of
10. Answer the following questions: 10.1 What characteristic of the carrier wave is changed to represent the data in ASK? a. amplitude b. frequency c. phase d. period 10.2 What kind of keying or modulation changes both the amplitude and phase of a carrier wave to represent data? a. FM 6. FSK c. PSK d. QAM 10.3 PSK is keying, not analog modulation. a. true b. false 11. Match. Data is the original information and signal is the information as...
5. Consider the following message signal: -2 Assume that the carrier frequency is f are kr 105, kp 25 respectively. 108 Hz, and frequency and phase deviation constants Find the maximum and minimum frequency deviation for FM, and sketch the FM wave for a duration of 103 seconds shown in the above figure (5 points). a. b. Find the maximum and minimum frequency deviation for PM, sketch the PM wave for a duration of 103 seconds shown in the above...
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