Title:
PHASE-LOCKED LOOP CIRCUIT, CONTROL METHOD, CHARGE PUMP, AND CHIP
Document Type and Number:
WIPO Patent Application WO/2023/124557
Kind Code:
A1
Abstract:
The present application provides a phase-locked loop circuit, a control method, a charge pump, and a chip. The circuit comprises a phase frequency detector, used to receive a reference clock signal and an output signal of a frequency divider, and generate a charging or discharging control signal; a charge pump module, used to determine charging or discharging according to the charging or discharging control signal, and also used to determine a charging or discharging current level, and generate a corresponding charging current or discharging current according to the determined charging or discharging, and the charging or discharging current level; a loop filter, used to filter the charging current or the discharging current; a voltage-controlled oscillator, used to generate a phase-locked loop output signal having a preset frequency; and a frequency divider, used to perform frequency division on the phase-locked loop output signal and input a signal obtained after frequency division as an output signal to the phase frequency detector. The circuit provided in the present application not only achieves the function of a phase-locked loop, but also reduces stray noise in the phase-locked loop, improving bandwidth characteristics.
Inventors:
CAI YAN (CN)
LIU SHUAIFENG (CN)
LIU SHUAIFENG (CN)
Application Number:
PCT/CN2022/130896
Publication Date:
July 06, 2023
Filing Date:
November 09, 2022
Export Citation:
Assignee:
HEFEI CHIPSEA ELECTRONICS TECH CO LTD (CN)
International Classes:
H03L7/087; H03L7/089; H03L7/093; H03L7/099
Foreign References:
| CN114301452A | 2022-04-08 | |||
| CN107634759A | 2018-01-26 | |||
| CN106685415A | 2017-05-17 | |||
| US20090033407A1 | 2009-02-05 |
Attorney, Agent or Firm:
SHENZHEN CHINA INNOVATION SOUTH INTELLECTUAL PROPERTY AGENCY CO., LTD. (CN)
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