Explain how a phase-locked loop works with regards to FM demodulation.
Explain how a phase-locked loop works with regards to FM demodulation.
1)In FM modulation, what aspect of the carrier is being modulated? 2)Explain in your own words, how a phase-locked loop works with regards to FM demodulation.
Problem 3: Explain how the PLL loop shown below works. Show mathematically that for FM input given by u(t) Accos(2 fe+ (t) where (t) = 2TK, m(t)at, the output can be designed so that к m(t). vkv v(t) (r) Loop filter 8(1) d(t) 21
Problem 3: Explain how the PLL loop shown below works. Show mathematically that for FM input given by u(t) Accos(2 fe+ (t) where (t) = 2TK, m(t)at, the output can be designed so that к m(t)....
1. In the demodulation DSB-SC AM signals, there is a need for a phase-coherent or synchronous demodulator for recovering the message signal from the received signal. That is, the phase of the locally generated sinusoid should ideally be equal to the phase of the received carrier. What are the ways by which a sinusiod at the receiver can be generated phase-locked to the phase of incoming carrier signal ? Explain with the aid of block diagrams, and discuss their advantages...
Exercise 4.6.4 Consider the frequency demodulation scheme shown in Fig. 4.8 in which the incoming FM wave s(t) is passed through a delay line that produces a phase shift of-?/2 radians at the carrier frequency fc. The delay-line output is subtracted from s(t), and the resulting composite wave is then envelope-detected. This demodulator finds application in demodulating FM waves at microwave frequencies. Assuming that analyze the operation of this demodulator when the modulation index ? is less than unity and...
1.) Angle Modulation can be subdivided into phase modulation (PM) and frequency modulation (FM). Highlight the differences between FM and PM. What is meant by the term instantaneous frequency? 2.) Describe what is meant by the term "Zero-Crossings" of a FM or PM wave. 3.) Is PM and/or FM a linear modulation technique? Explain. 4.) Describe one important advantage that angle modulation has over amplitude modulation. Describe one distinct disadvantage that angle modulation has over amplitude modulation. 5.) Describe the...
4. (4 Marks) The linear model of a phase detector (phase-lock-loop) can be represented by figure 4. Voltage-controlled oscillator Amplifier Filter LE Figure 4 Phase locked loop The phase-lock systems are designed to maintain zero difference in phase betweer the input carrier signal and a local voltage controlled oscillator. Phase lock loops find application in colour television, missile tracking and space telemetry. The filter for a particular application is chosen as: 10(s +10) (s +D(s +100) F(s) It is desired...
Explain how the switched reluctance motor (SRM) works. Draw the drive circuit for a three phase 12/8 SRM and explain the working states for one phase. Explain the operation of a current controlled SRM drive and propose a design for a suitable control system.
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...
D) Briefly explain how wideband FM can be generated from narrow band FM and how the carrier frequency increase can be avoided.
(SULIT) C. A slope detector is probably the simplest FM demodulator, however it has several disadvantages which include poor linearity, difficulty in tuning, and lack of provisions of limiting. Suggest the best demodulation circuit technique that can resolve those problems. Show the relevant FM demodulator circuit and explain how this suggested demodulation circuit/technique is suitable in solving such issues. (CO2: PO2 - 7 marks) d. A periodic square wave m(t) of period T, frequency modulates a carrier of frequency fc...