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Phase-locked loop

A phase-locked loop and circuit technology, applied in the direction of electrical components, automatic power control, etc., can solve the problem of increased jitter of the phase-locked loop 100, and achieve the effect of reducing gain and reducing jitter

Inactive Publication Date: 2009-12-02
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to provide an output signal with the desired frequency V out , the gain K of the VCO 140 VCO must be increased, and the increased gain of K VCO Will cause the jitter (jitter) of the phase-locked loop 100 to increase

Method used

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Embodiment Construction

[0013] Certain terms are used throughout the description and claims to refer to particular components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of components as a criterion for distinguishing. "Include" mentioned throughout the description and claims is an open-ended term, so it should be interpreted as "including but not limited to". In addition, the term "coupled" herein includes any direct and indirect means of electrical connection. Therefore, if it is described that the first device is coupled to the second device, it means that the first device may be directly electrically connected to the second device, or indirectly electrically connected to the second device through other devices or connection means.

[0014] image 3 is a schematic diagram of a pha...

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Abstract

The invention provides a phase-locked loop which includes a phase detector, a charge pump and a controllable oscillator. The phase detector is supplied by a first supply voltage and is utilized for comparing a phase difference between an reference input signal and a feedback signal based on an output signal to generate at least one detect signal. The charge pump is supplied by a second supply voltage, and is utilized for generating a control signal with charge amounts according to the detect signal, where the first supply voltage is different from the second supply voltage. The controllable oscillator is utilized for generating the output signal according to the control signal, wherein a frequency of the output signal is adjusted by the control signal.

Description

technical field [0001] The present invention relates to a phase-locked loop (a phase-locked loop, PLL), in particular to a lock having a charge pump (chargepump) comprising at least one input / output device (I / O device) phase loop. Background technique [0002] figure 1 is a brief schematic diagram of an existing phase-locked loop 100 . The phase-locked loop 100 includes a phase detector (phase detector, PD) 110, a charge pump 120, a low-pass filter (low-pass filter, LPF) 130, and a voltage-controlled oscillator (voltage-controlled oscillator, VCO) 140, wherein All transistors (transistors) in the phase-locked loop 100 are powered by the same supply voltage V DD powered by. [0003] In the phase locked loop 100, the phase detector 110 compares the reference input signal V ref with output signal V out to generate the detection signal VPD, and the charge pump 120 receives the detection signal V PD and generate the control signal V c . Then, the low-pass filter 130 filt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/085H03L7/089
CPCH03L7/0896H03L7/10H03L7/18
Inventor 高宏鑫徐哲祥
Owner MEDIATEK INC