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Analog phase-locked loop circuit

A phase-locked loop and circuit technology, applied in the direction of electrical components, automatic power control, etc., can solve the problems of difficult to guarantee process quality, unreasonable design, large discreteness, etc., to achieve compact structure, avoid exclusive supply, circuit simple effect

Inactive Publication Date: 2017-06-20
张凤军
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nowadays, many analog phase-locked loops PLL-II used are completely composed of discrete components such as varactor diodes, which have large discreteness, unreasonable design, and difficult to guarantee the quality of workmanship. However, analog phase-locked loops are necessary in some circuits.

Method used

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Embodiment Construction

[0014] The present invention will be further described below in conjunction with drawings and embodiments.

[0015] Such as figure 1 , the analog phase-locked loop circuit is composed of the basic circuit of the second-order phase-locked loop of a typical active proportional integral filter. Among them: phase detector, 1 / N frequency divider, 1 / 256 frequency divider and reference source detection circuit are made in EPLD, and other components can be welded in a circuit similar in size to PLL-II. Compared with PLL-II, the pins used by circuits other than EPLD can save the -5V power supply pin and only use a single +5V power supply. A logic level pin indicating the presence or absence of the reference source signal is added to the circuit.

[0016] The phase detector circuit adopts a digital frequency and phase detector with double-terminal output and falling edge phase comparison. This phase detector is used to be compatible with PLL-II pins. This circuit adopts a single pha...

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Abstract

An analog phase-locked loop circuit is composed of a second-order phase-locked loop basic circuit of a typical active proportional integral filter. Among them: phase detector, 1 / N frequency divider, 1 / 256 frequency divider and reference source detection circuit are made in EPLD, and other components can be welded in a circuit similar in size to PLL-II. The structure is compact and the circuit is relatively simple. It can fully control the quality of the phase-locked loop independently, and can be compatible with the existing analog phase-locked loop for direct replacement. It can also avoid the exclusive supply situation caused by TRU050.

Description

technical field [0001] The invention relates to an analog phase-locked loop circuit, which is suitable for network products. Background technique [0002] Phase Locked Loop Technology (Phase Locked Loop Technology) is a science that realizes phase automatic control, and is a new technology that specializes in studying the phase relationship of a system. The phase-locked loop is a basic and very important module in analog and digital-analog hybrid circuits. It is a system that can track the phase and frequency of the input signal and output other frequency signals that are phase-locked and low-jitter. In system applications, it is often a powerful technical means to provide a complete solution. It is an indispensable unit in special chips such as communication systems, digital circuits, hard disk drive circuits, and GPUs, and directly affects the working stability of the entire system and the quality of various indicators. Phase-locked loops (PLI) are used in almost every c...

Claims

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Application Information

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IPC IPC(8): H03L7/18
Inventor 张凤军
Owner 张凤军