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Clock generating circuit and related data restoring circuit

A technology for recovering circuits and data, applied in electrical components, high-definition television systems, automatic power control, etc., can solve problems such as long data recovery tracking time and inability to quickly reach the optimal sampling phase

Active Publication Date: 2006-08-02
REALTEK SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has a long tracking time for data recovery and cannot quickly reach the optimal sampling phase.

Method used

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  • Clock generating circuit and related data restoring circuit
  • Clock generating circuit and related data restoring circuit
  • Clock generating circuit and related data restoring circuit

Examples

Experimental program
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Embodiment Construction

[0035] The clock generation circuit disclosed in the embodiments of the present invention and the data recovery circuit using the clock generation circuit are described in detail below with reference to the drawings.

[0036] image 3 It is the first embodiment of the clock generation circuit of the present invention and a feedback data recovery circuit using the circuit. As shown in the figure, the recovery circuit 60 includes a phase frequency detector (phase frequency detector) 41, a charge pump and loop filter (charge pump and loop filter) 42, a multi-phase voltage-controlled oscillator (multi-phase VCO) 43, a multiplexer 48, and a voltage-controlled oscillator circuit formed by a frequency divider 47 (in image 3 Shown as loop A), and a data recovery loop (in image 3 Shown as loop B), and a D-type flip-flop 46. image 3 The implementation of each component shown in the above-mentioned Larsson document can be referred to, which is widely known by those skilled in the a...

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PUM

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Abstract

This invention is a kind of clock generating circuit and related data restore circuit. The clock generating circuit concludes a voltage controlled oscillator which generates a sampling signal and multiphase clock; a multiplexer which receives multiphase clock and outputs a clock of the multiphase clock based on a selecting signal; a phase frequency detector which receives the output signal of multiplexer and a referenced clock. It also generates a phase frequency error signal; a charge pumping and loop filter, which receives the phase frequency error signal and generates a controlling voltage; a phase detector which receives the sampling signal and input signal. It also generates a phase error signal; a digital low-pass filter which receives the phase err[r signal and generates the selecting signal; the digital low-pass filter clears off the phase accumulative error when generating the selecting signal to instruct the multiplexer to switch phase.

Description

technical field [0001] The invention relates to a clock generation circuit and a data recovery circuit using the clock generation circuit, in particular to a clock generation circuit using a digital low-pass filter with a clearing function and a data recovery circuit using the clock generation circuit. Background technique [0002] In the data interface of digital TV such as Digital Video Interactive (DVI) or High Definition Media Interface (HDMI), a data restoration circuit will be used to convert red, blue, green, etc. into different colors. Data recovery in serial signals of video data. Data recovery circuits generally include Feedback-based data recovery and Feedforward-based data recovery. [0003] figure 1 Circuit architecture showing feedback-style data recovery. As shown in the figure, the feedback data recovery circuit 10 includes a clock generation unit 11 and a phase detection and sampling unit 12 . The clock generating unit 11 generates a multi-phase clock (o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/16H03L7/06H04N7/015
Inventor 吕昭信
Owner REALTEK SEMICON CORP
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