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Phase recovery circuit, period signal generator, power supply management circuit and method

A periodic signal and phase recovery technology, applied in the direction of logic circuit pulse generation, electrical pulse generation, pulse generation, etc., can solve the problems of unfavorable user applications

Active Publication Date: 2009-12-02
LEADTREND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the periodic signal CLK affected by noise is not conducive to the user's application

Method used

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  • Phase recovery circuit, period signal generator, power supply management circuit and method
  • Phase recovery circuit, period signal generator, power supply management circuit and method
  • Phase recovery circuit, period signal generator, power supply management circuit and method

Examples

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Embodiment Construction

[0039] Please refer to Figure 4 . Figure 4 It is a schematic diagram of the periodic signal generator 400 with high immunity to noise of the present invention. Such as Figure 4 As shown, the periodic signal generator 400 includes the periodic signal generator 100 and a phase recovery circuit (phase recovery circuit) 410 . The periodic signal generator 100 of the periodic signal generator 400 is the same as that described above, and the relevant functional descriptions will not be repeated here. For example, the periodic signal generator 400 is a ring oscillator with an odd number of inverters connected in series, and may also include a buffer B. The phase recovery circuit 410 includes a noise detector 411 , a phase detector 412 and a phase locker 413 .

[0040] The noise detector 411 is used to detect whether there may be noise on the bias source VDD or VSS. If there may be noise on the bias source VDD or VSS, the noise detector 411 generates a noise detection signal S...

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PUM

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Abstract

The invention relates to a phase recovery circuit used for preventing noise from interfering a periodic signal generator, the phase recovery circuit comprises a noise detector, a phase detector and a phase locker. The periodic signal generator generates a periodic signal. The noise detector is used for detecting the noise so as to generate a noise detection signal. The phase detector is triggered by the noise detection signal and is used for detecting the phase of the periodic signal so as to output a phase detection signal. The phase locker locks the periodic signal into a preset phase within the preset time after the noise detection signal occurs according to the phase detection signal, and releases the periodic signal after the preset time. Therefore, the phase of the periodic signal can not be influenced because of the occurrence of the noise within the preset time.

Description

technical field [0001] The present invention relates to a periodic signal generator (oscillator), more specifically, to a periodic signal generator that is not affected by noise. Background technique [0002] Please refer to figure 1 . figure 1 is a schematic diagram of a prior art periodic signal generator 100 . The periodic signal generator 100 is a conventional ring oscillator, which has an "odd number" of inverters connected in series. Each inverter is coupled between a bias source VDD (set the output voltage as VDD) and a bias source VSS (set the output voltage as VSS). The bias source VDD is used to provide power; the bias source VSS can be a ground. The period signal generator 100 may further include a buffer B coupled to the output end of the period signal generator 100 for receiving the period signal CLK and buffering the period signal CLK to generate the period signal CLKB. Buffer B can be implemented as an amplifier or a comparator. The purpose of setting bu...

Claims

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Application Information

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IPC IPC(8): H03K3/013H03K3/03
Inventor 贾儒林
Owner LEADTREND TECH