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Method and circuit for developing spread-spectrum or overfrequency clock

A technology for generating circuits and circuits, which is applied in the direction of generating/distributing signals, electrical components, automatic power control, etc., and can solve problems such as phase noise that is easy to deteriorate

Active Publication Date: 2012-02-08
REALTEK SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] e. There is a spine (Spur) with fractional frequency division, which is easy to deteriorate the phase noise

Method used

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  • Method and circuit for developing spread-spectrum or overfrequency clock
  • Method and circuit for developing spread-spectrum or overfrequency clock
  • Method and circuit for developing spread-spectrum or overfrequency clock

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Embodiment Construction

[0043] The present invention is a method and circuit for generating spread spectrum and / or overfrequency clock, its circuit structure is as follows Figure 5As shown, it includes a first-stage circuit 401 and a second-stage circuit 409, wherein the first-stage circuit 401 utilizes phase-swallowing and / or fractional frequency division technology to input clock signal Fin to the first-stage circuit 401 After achieving high frequency resolution, the clock signal Fmid output by the first-stage circuit 401 is sent to the second-stage circuit 409, and the second-stage circuit 409 uses a phase-locked loop to multiply the frequency of the clock signal Fmid processing to extend its frequency range. In this way, when the circuit is used for frequency spreading, it is only necessary to change the input signal Fcode of an accumulator 405 included in the first-stage circuit 401, so that the input clock signal Fin of the first-stage circuit 401 is similar to Fractional frequency division p...

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PUM

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Abstract

The invention relates to a circuit for generating spread-spectrum / over-frequency clock, which comprises the first and second circuits, wherein the first circuit uses phase contain technique and decimal frequency division technique to realize high frequency resolution; the second circuit uses phase-lock loop to time the frequency of output signal of first circuit to spread the spectrum range.

Description

technical field [0001] The invention relates to an electronic circuit for frequency modulation, in particular to a circuit for generating spread spectrum and / or overfrequency clocks by means of frequency synthesis technology. Background technique [0002] In recent years, in view of the large demand for high-speed (High-Speed) electronic devices in the market, many circuits and components used therein have produced problems of Electro-Magnetic Interference (EMI). Since the high-speed electronic device must work at a high operating frequency, and the higher operating frequency relatively increases the degree of electromagnetic wave interference, therefore, how to effectively reduce the electromagnetic wave interference technology while increasing the circuit operating speed , has become an issue that circuit designers and manufacturers urgently need to overcome. [0003] Press, the existing anti-electromagnetic interference design can be roughly divided into the following ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/00G06F1/04
Inventor 张鹏展谷立军丁然
Owner REALTEK SEMICON CORP