Phase Lock Loop Block Diagram
It is a very useful device for synchronous communication. In this video i have explained phase lock loop by following outlines.
Phase locked loop system block diagram the figure shows the block diagram of the phase locked loop system in fm transmitter that consists of different blocks such as a crystal oscillator phase detector loop filter voltage controlled oscillator vco and frequency divider.
Phase lock loop block diagram. The phase locked loop or pll is an electronic circuit with a voltage controlled oscillator whose output frequency is continuously adjusted according to the input signals frequency. Block diagram and working principle of pll the phase locked loop consists of a phase detector a voltage control oscillator and in between them a low pass filter is fixed. Phase locked loop diagram showing voltages the voltage controlled oscillator vco within the pll produces a signal which enters the phase detector.
The error signal is then low pass filtered and used to drive a vco which creates an output phase. A versatile building block for micropower digital and analog applications 3 cd4046b pll technical description figure 2 shows a block diagram of the cd4046b which has been implemented on a single monolithic integrated circuit. They also lock the output phase to the input phase as you would expect from the name phase locked loop but its a different sort of lock the locking action is made possible by negative feedback ie by routing the output signal back to the phase detector as shown in the above diagram.
A phase detector basically a comparator which compares the input frequency fiwith the feedback frequency fo the phase detector provides an output error voltage ver fifowhich is a dc voltage. Block diagram phase locked loops the input signal vi with an input frequency fi is passed through a phase detector. Phase locked loops are the circuits used to maintain synchronization between input and output frequency of oscillator circuits by comparing the difference in phase of the two signalswith the evolution of ic it has emerged as the basic building block of electronic circuits.
Here the phase of the signals from the vco and the incoming reference signal are compared and a resulting difference or error voltage is produced. Need of phase lock loop 4. Phase lock loop 2.
Block diagram of a phase locked loop a phase detector compares two input signals and produces an error signal which is proportional to their phase difference. 4 cd4046b phase locked loop. The pll structure consists of a low power linear vco and two.
A phase locked loop is used for tracking phase and frequency of the input signal. The input signal vi with an input frequency fi is conceded by a phase detector. Basics of phase lock loop 3.
What is phase locked loop. Block diagram of phase lock loop 5.
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