What are the components of PLL?

What are the components of PLL?

The phase-locked loop (PLL) is a frequency- and phase-sensitive feedback control circuit. It consists of three major parts: a mixer or phase detector, a LPF, and a VCO, as shown in Fig. 4.19. The signal from the VCO is compared to the input signal.

Which circuit is a block in PLL?

phase locked loop
The phase locked loop or PLL is a particularly useful circuit block that is widely used in radio frequency or wireless applications.

What is PLL and its applications?

A phase-locked loop or phase lock loop (PLL) is a control system that generates an output signal whose phase is related to the phase of an input signal. Phase-locked loops are widely employed in radio, telecommunications, computers and other electronic applications.

What is the basic principle of PLL?

The input signal is directly proportional to the output frequency of the VCO (fo). The input and output frequencies are compared and adjusted through the feedback loop until the output frequency is equal to the input frequency. Hence, the PLL works like free running, capture, and phase lock.

What are the components of 565 PLL block diagram?

Voltage Controlled Oscillator : 1) Third section of the PLL is the voltage controlled oscillator. The VCO generates an output frequency that is directly proportional of its input voltage. 2) The VCO frequency is compared with the input frequencies and adjusted until it is equal to the input frequencies.

What is the principle of PLL?

What are the advantages and applications of PLL?

The advantage of phase-lock loops is that they receive an input signal, compare this to the feedback of their internal clock generated by a voltage-controlled oscillator (VCO), and adjust the VCO by way of the charge pump to match the new input frequency and synchronize the internal and external clocks.

What are the different stages of PLL?

Thus, a PLL goes through three stages (i) free running, (ii) capture and (iii) locked or tracking. Capture range: the range of frequencies over which the PLL can acquire lock with an input signal is called the capture range.

How are phase detectors used in a block diagram?

The block diagram consist of a phase detector which acts as a phase comparator, an amplifier, and a low pass filter with the combination of the resistor (3.6 kilo ohm) and capacitor C2. The output of the amplifier is fed back to the VCO. The different pins representing that of the IC are also shown in the block diagram.

How is a phase detector used in a RF mixer?

A phase detector is basically an RF mixer that multiplies the two input signals and yields their product. Figure 5.4.7 shows the block diagram of jitter measurement setup based on a phase detector. This setup measures the fundamental clock component of the jittered waveform and compares it with a jitter-free reference clock in an RF mixer.

What are the three types of phase locked loops?

Phase Locked Loops (PLL) 1 1. Phase Detector. This comparator circuit compares the input frequency and the VCO output frequency and produces a dc voltage that is proportional to 2 2. Low Pass Filter (LPF) 3 3. Voltage Controlled Oscillator (VCO)

What kind of phase detectors are used in PLL?

Even though most of the monolithic PLL integrated circuits use analog phase detectors, the majority of discrete phase detectors are of the digital type. One of the most commonly used analog phase detector is the double balanced mixer circuit. Some of the common digital type phase detectors are