Phase-locked loop (PLL) circuits exist in a wide variety of high frequency applications, from simple clock clean-up circuits, to local oscillators (LOs) for high performance radio communication links, and ultrafast switching frequency synthesizers in vector network analyzers (VNA).

Phase-locked loops (PLLs), especially in monolithic form, have significantly increased use in signal-processing and digital systems.

A phase-locked loop or phase lock loop (PLL) is a control system that generates an output signal whose phase is fixed relative to the phase of an input signal. Keeping the input and output phase in lockstep also implies keeping the input and output frequencies the same, thus a phase-locked loop can also track an input frequency.

Phase Locked Loop (PLL) is one of the vital blocks in linear systems. It is useful in communication systems such as radars, satellites, FMs, etc. This chapter discusses about the block diagram of PLL and IC 565 in detail. A Phase Locked Loop (PLL) mainly consists of the following three blocks −.

Mar 29, 2025 · The CD4046 is a phase-locked loop (PLL) CMOS IC. Integrated within the CD4046 are two phase comparators and a voltage-controlled oscillator (VCO), both of which have a separate common input.

Phase-locked loops can be used, for example, to generate stable output high frequency signals from a fixed low-frequency signal. Figure 1A shows the basic model for a PLL. The PLL can be analyzed as a negative feedback system using Laplace Transform theory with a forward gain term, G(s), and a feedback term, H(s), as shown in Figure 1B.

The HC/HCT4046A PLL with VCO is a high-speed CMOS IC designed for use in general-purpose PLL applications, including frequency modulation, demodulation, discrimination, synthesis, and multiplication.

Nov 13, 2024 · IC phase locked loops (PLL) are closed-loop frequency controls that are based on the phase difference between the input signal and the output signal of a controlled oscillator. An IC phase-locked loop generally consists of a phase detector, a loop filter, voltage controlled oscillator (VCO) and an amplifier.

IC 565 PLL is available in a 14 pin DIP package and 10 pin metal can package. Fig. 2.124 shows 14-pin package configuration for IC 565 and Fig. 2.125 shows the block diagram for IC 565. The block diagram of IC 565 PLL consists of phase detector, amplifier, low pass filter and VCO.

PLL is now readily available as IC’s which were developed in the SE/NE 560 series. Some of the commonly used ones are the SE/NE 560,561,562,564,565 and 567.The difference between each one of them is in the different parameters like operating frequency range, power supply requirements, and frequency and bandwidth ranges.