Quick starting circuit for charge pump phase-locked loop

A fast start-up and charge pump technology, applied in the automatic control of power, electrical components, etc., can solve the problem that the phase-locked loop cannot be locked quickly

Inactive Publication Date: 2015-10-21
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] What the present invention aims to solve is to propose a quick start circuit for a charge p...

Method used

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  • Quick starting circuit for charge pump phase-locked loop
  • Quick starting circuit for charge pump phase-locked loop
  • Quick starting circuit for charge pump phase-locked loop

Examples

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Embodiment Construction

[0021] The present invention proposes a fast charging charge pump phase-locked loop, the specific circuit structure is as follows Figure 2-Figure 6 As shown, the specific connection relationship is as follows:

[0022] The input of the frequency and phase detector is the clock signal CLK and the output signal Fout of the flow control oscillator, and the output is two charge and discharge control signals up and down required by the charge pump.

[0023] The sources and substrates of MP1, MP3, MP15, and MP16 inside the charge pump and the substrates of MP2, MP4, and MP5 are connected to the power supply voltage, and the sources and substrates of MN2, MN3, and MN10 are connected to the substrates of MN1 and MN4. Potential, the drain of MP1 is connected to the source of MP2, the drain of MP15 is connected to the source of MP4, the drain of MP16 is connected to the source of MP5, the source of MN1 is connected to the drain of MN2, the source of MN4 is connected to the drain of MN1...

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PUM

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Abstract

The invention belongs to the technical field of an electronic circuit and specifically relates to a quick starting circuit for a charge pump phase-locked loop. The quick starting circuit comprises a phase-frequency detector, a rapid charging module, a charge pump, a low-pass filter, a voltage-controlled oscillator and a frequency divider. The phase-frequency detector is connected with an external clock signal, the input end thereof is connected with the output end of the voltage-controlled oscillator, the first output end thereof is connected with the first input end of the charge pump, and the second output end is connected with the second input end of the charge pump; the output end of the charge pump is connected with the input end of the voltage-controlled oscillator through the low-pass filter; the output end of the rapid charging module is connected with the low-pass filter through a switching tube; the output end of the voltage-controlled oscillator is connected with the input end of the frequency divider; the output end of the frequency divider outputs an enable signal through a D trigger; and the enable signal is connected to the control end of the switching tube. The circuit has the beneficial effect of providing the charge pump phase-locked loop capable of rapidly locking.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and in particular relates to a quick start circuit for a phase-locked loop of a charge pump. Background technique [0002] In the field of electronics and communication, the phase-locked loop has become an indispensable basic device. With the development and maturity of large-scale integrated circuit technology, the phase-locked loop using the charge pump structure is easy to integrate, low power consumption, and low jitter. , No phase difference locking and other advantages have been widely used. Such as figure 1 As shown, the basic charge-pump phase-locked loop includes a phase-frequency detector PFD, a charge pump CP, a low-pass filter LPF, a voltage-controlled oscillator VCO, and a frequency divider DIV. The frequency and phase detector compares the phase and frequency difference of the two signals, and generates a control signal to the charge pump, and the charge pump charges a...

Claims

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Application Information

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IPC IPC(8): H03L7/08H03L7/099
Inventor 明鑫王军李天生冯捷斐张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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