Unlock instant, AI-driven research and patent intelligence for your innovation.

Phase frequency detector and phase-locked loop circuit

A technology of frequency and phase detectors and reset circuits, which is applied in the field of frequency and phase detectors and phase-locked loop circuits, can solve the problems of poor output signal performance and high phase noise, and achieve the effects of improving energy production and reducing phase noise

Pending Publication Date: 2021-11-30
无锡有容微电子有限公司
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the fractional frequency phase-locked loop circuit in the prior art has high phase noise and poor output signal performance to be solved

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Phase frequency detector and phase-locked loop circuit
  • Phase frequency detector and phase-locked loop circuit
  • Phase frequency detector and phase-locked loop circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] In order to make the above objects, features and advantages of the present invention more obvious and understandable, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0022] figure 2 It is a schematic diagram of the connection structure of the frequency and phase detector and the charge pump in the traditional fractional frequency division phase-locked loop circuit. like figure 2 As shown, the frequency of the traditional fractional frequency phase-locked loop circuit has a certain bandwidth, and the main contributors to the phase noise within the final output bandwidth are the reference clock, frequency and phase detector, charge pump and other modules. The phase noise of the PLL output comes from the phase noise of these blocks multiplied by the divider ratio. When designing the circuit, the performance is mainly improved by adjusting the size of MOS devices such as switches. In addit...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a phase frequency detector and a phase-locked loop circuit. In the technical scheme provided by the invention, phase comparison is carried out by utilizing a rising edge and a falling edge of an input clock. According to the design, two times of phase comparison can be completed in one clock period, which is equivalent to using two times of reference clock frequency, so that the frequency dividing ratio and the phase noise in the bandwidth of the phase-locked loop are reduced, and the output signal performance of the phase-locked loop is improved.

Description

technical field [0001] The invention relates to the field of integrated circuit design, in particular to a frequency and phase detector and a phase-locked loop circuit. Background technique [0002] As a common module in integrated circuits, phase-locked loops are being used more and more widely. In the transceiver system, the phase-locked loop can be used to generate the local oscillator signal to realize the modulation and demodulation of the signal. In an analog circuit, a phase-locked loop can be used to generate a high-precision clock as an input of an analog-to-digital converter (AnalogDigital Converter, referred to as "ADC") and other components. [0003] The phase-locked loop system has various structures. The analog phase-locked loop system based on the charge pump is a kind of phase-locked loop structure that is widely used at present. Its structural principle is as follows: figure 1 As shown, it is composed of frequency and phase detectors, charge pumps, filters...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/087
CPCH03L7/087
Inventor 邬成汤小虎陈晓哲姚泽军
Owner 无锡有容微电子有限公司