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1. (WO2018145612) CHARGE PUMP CIRCUIT AND PHASE-LOCKED LOOP

Pub. No.:    WO/2018/145612    International Application No.:    PCT/CN2018/075271
Publication Date: Fri Aug 17 01:59:59 CEST 2018 International Filing Date: Tue Feb 06 00:59:59 CET 2018
IPC: H03L 7/089
Applicants: CHINA COMMUNICATION MICROELECTRONICS TECHNOLOGY CO., LTD.
深圳市华讯方舟微电子科技有限公司
CHINA COMMUNICATION TECHNOLOGY CO., LTD.
华讯方舟科技有限公司
Inventors: DING, Qing
丁庆
ZHOU, Haifeng
周海峰
WU, Guangsheng
吴光胜
LI, Xiaocong
李晓丛
Title: CHARGE PUMP CIRCUIT AND PHASE-LOCKED LOOP
Abstract:
A charge pump circuit and a phase-locked loop, the circuit comprising a start module (10), a bias module (20), a current mirror module (30), a charging and discharging feedback control module (40) and a charging and discharging matching module (50) which are electrically connected in sequence. The start module (10) is used for starting the bias module (20). The bias module (20) is used for generating constant bias current and outputting same to the current mirror module (30). The current mirror module (30) is used for receiving the bias current, and amplifying the bias current and outputting the amplified bias current in two paths. The charging and discharging feedback control module (40) is used for detecting the output voltage of a charge pump and controlling, according to the feedback of the output voltage, the charging current or the discharging current in the charging and discharging matching module (50), so as to suppress the mismatch between the charging current and the discharging current. The charging and discharging matching module (50) is used for receiving an external charging control signal or an external discharging control signal, so as to charge or discharge the output load of the charge pump. The described charge pump can maintain the match of the charging current and the discharging current within a wider output voltage range, without the need of an operational amplifier. The circuit structure is simple and can operate at a higher frequency.