Charge pump phase-locked loop of configurable start-up circuit

A start-up circuit, charge pump technology, applied in the direction of electrical components, power automatic control, etc., can solve the problem of long locking time of the phase-locked loop, and achieve the effect of reducing the locking time

Active Publication Date: 2018-10-30
BEIJING MXTRONICS CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For the traditional charge pump phase-locked loop, the initial voltage of the loop filter is zero, and the voltage-controlled oscillator does not vibrate. Therefore, after the ph

Method used

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  • Charge pump phase-locked loop of configurable start-up circuit
  • Charge pump phase-locked loop of configurable start-up circuit
  • Charge pump phase-locked loop of configurable start-up circuit

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Embodiment Construction

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] figure 1 Shown is a schematic diagram of the overall structure of the charge pump phase-locked loop using a configurable start-up circuit in the present invention. The charge pump phase-locked loop with a configurable start-up circuit includes a start-up circuit B107 and a phase-locked loop, and the phase-locked loop is composed of a frequency and phase detector B101, a charge pump B102, a loop filter B103, an oscillator bias generation circuit B104, It consists of a voltage controlled oscillator B105 and a feedback frequency divider B106.

[0028] The first input terminal of the frequency and phase detector B101 is connected to the input clock terminal CLK of the phase-locked loop in, the second input terminal of the frequency and phase detector B101 is connected to the output of the feedback frequency divider B106, and the ...

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PUM

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Abstract

The invention discloses a charge pump phase-locked loop of a configurable start-up circuit. The charge pump phase-locked loop charges a loop filter B103 through the configurable start-up circuit B107before the phase-locked loop operates, generates a start-up voltage, drives an oscillator bias generation circuit B104 to generate a bias voltage, and controls a voltage-controlled oscillator B105 tooscillate, so that the voltage-controlled oscillator starts to oscillate at a specific frequency close to a target frequency, and the activation of the phase-locked loop is completed. Compared with aconventional charge pump phase-locked loop, a user can operate the voltage-controlled oscillator at the specific frequency by a configuring signal before the phase-locked loop starts to work accordingto actual needs, thereby accelerating the locking process of the phase-locked loop after the phase-locked loop starts to work.

Description

technical field [0001] The invention relates to a charge pump phase-locked loop adopting a configurable starting circuit, which belongs to the technical field of integrated circuits. Background technique [0002] Phase-locked loop is a frequency and phase synchronization technology realized by feedback control principle, which can provide low-noise clock signal, and has been widely used in wireless communication, navigation, computer and other fields. The charge pump phase-locked loop is a typical representative of the digital-analog hybrid phase-locked loop. Its theoretical static phase error is zero, and it has significant advantages such as high speed, low jitter, and low power consumption. It is currently the most widely used phase-locked loop. [0003] With the continuous improvement of integrated circuit technology and continuous increase in scale, integrated circuit systems have higher and higher requirements for the performance of phase-locked loop circuits. The loc...

Claims

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Application Information

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IPC IPC(8): H03L7/089H03L7/093H03L7/10
CPCH03L7/0891H03L7/093H03L7/10
Inventor 杨铭谦陈雷王科迪张健李智李学武张彦龙
Owner BEIJING MXTRONICS CORP
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