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Spread spectrum clock generator using arrival locked loop technology

A spread spectrum, time-of-arrival technology, applied in the field of digital signal processing, which can solve a large number of problems such as

Inactive Publication Date: 2009-11-18
吉斯通半导体有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although random polarity switching is an effective technique to increase the randomness of frequency spreading, it requires an additional random signal generator 602 and requires a lot of hardware to implement the random signal generator 602

Method used

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  • Spread spectrum clock generator using arrival locked loop technology
  • Spread spectrum clock generator using arrival locked loop technology
  • Spread spectrum clock generator using arrival locked loop technology

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Embodiment Construction

[0032] figure 2 The shown nonlinear feedback control loop 150 becomes a spread spectrum clock generator, because the nonlinear error comparator 118 will inevitably produce wrong judgments due to its own loop delay; When there are as many judgments as wrong judgments, the nonlinear feedback control loop 150 will oscillate and the oscillation of the loop is modulated by random noise around the judgment threshold of the nonlinear error comparator 118, because a small Noise disturbances can change the output of the nonlinear error comparator 118 .

[0033] Once the non-linear error comparator 118 produces an output, the output will remain in the same state until a new output state is produced at the end of the next comparison cycle. As a result, the nonlinear error comparator 118 can only produce a digital H or L output state for the final error corrected output 115 regardless of how small the error input signal 114 is. The transfer function of the final error correction output...

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Abstract

A new technique using arrival locked loop technology to produce a spread spectrum clock signal with random frequency modulation and with precise variable frequency spread is presented. The arrival locked loop includes three modules, the arrival comparator with a precise spread control, the loop filter and the VCO. An arrival locked loop is made unstable and oscillates at a certain frequency to produce a low frequency modulation signal on the final error correction output to spread the high frequency output signal from VCO in frequency. The period of frequency spread in each cycle of the low frequency modulation signal also increases by a small random amount of time cycle after cycle until the period of frequency spread becomes so long that cycle-slip is produced to the punctual signal at the input of arrival comparator to reset the period of frequency spread to a small amount.

Description

[0001] Application for cross-reference [0002] This application relates to and claims U.S. Provisional Application No. 60 / 827,288 (filed September 28, 2006), PCT Application No. PCT / US05 / 26842 (filed July 28, 2005), and PCT Application No. PCT / US06 / 17856 (filed May 4, 2006), and PCT Application No. PCT / US06 / 060599 (filed November 6, 2006), the entire contents of all of which are hereby incorporated by reference. technical field [0003] The present application relates to digital signal processing, and more particularly, the present application relates to methods, devices and systems for improved spread spectrum clock generation. Background technique [0004] Over the past decade, electronic products, especially PCs, have been very popular with spread spectrum clock technology. This technique effectively reduces spurious emissions from the clock signal and the peak strength of the PC's harmonics, allowing the PC to be manufactured with less RF shielding; that is, less cost,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/00
CPCH03D13/004H03L7/0891H03L7/087H03K3/84H03L7/18
Inventor 文·T·林
Owner 吉斯通半导体有限公司