Charge pump circuit used for charge pump phase-locked loop
US9419631B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 2013 |
| Grant date | Aug 16, 2016 |
| Priority date | — |
| Expiry date | Dec 10, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/0891
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A charge pump circuit used for a charge pump phase-locked loop that includes a charging and discharging unit, two complementary circuit units, two operational amplifier units, an inverter unit, and a current mirror unit. The charge pump circuit resolves the matching problem of charging and discharging currents and the charge sharing problem in existing charge pump circuits. Both complementary circuit units positively and reversely compensate the charging and discharging unit to keep the charging and discharging currents of capacitors constant. Thus, the problem of the change of charging and discharging currents is resolved, the voltage linear variation of the charge pump capacitors is achieved, and the charging and discharging of the capacitors can be accurately controlled. The charge pump circuit is simple in structure, easy to integrate, high in the matching precision of the charging and discharging current sources, and suitable for low voltage and low power consumption applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.