Best Engineering College in India Explained PLL Synthesizers FunctionsFrequency synthesizers usually perform their functions based on PLL or Phase Locked Loops. For this, PLL utilizes phase comparison data as basis to assure right operation. In this blog post, you will be able to know about the components and operations performed by PLL synthesizer, as explained by best engineering college in India professors. Block DiagramBlock diagram of Phase Locked Loop synthesizer represents a basic loop comprises of three basic types of circuit blocks named as voltage controlled oscillator, phase comparator and loop filter. However, in some of the cases, reference oscillator is also present in the block diagram, although it does not form part of the entire loop. The reason for this is that the loop or the system requires reference signal to perform its operations. Basic Operation of the LoopB.E. department faculties of best engineering college in India said that PLL or Phase Locked Loop performs its functions by simple comparison of phases present in two different signals. Firstly, reference signal and the signal generated from VCO enter phase comparator to produce another signal equal to phase difference in between the two different input signals. Later on, phase difference signal produced passes from loop filter and performs different functions, along with removal of unwanted products belonging to the signal. Lastly, the signal reaches to the control terminal of VCO or Voltage Controlled Oscillators.