Charge pump circuit and phase lock loop circuit having the same
US9257899B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 19, 2014 |
| Grant date | Feb 9, 2016 |
| Priority date | — |
| Expiry date | Sep 19, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/0896
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A charge pump circuit and a phase lock loop circuit (PLL) having the same are provided. A main voltage divider and an assistant voltage divider configured in the charge pump circuit generate a voltage division within a predetermined time of activating the charge pump circuit. Therefore, when the charge pump circuit initiates operating, a voltage of a control end of a main switch set configured in the charge pump circuit is set to be the voltage division. The voltage of the control end is gradually decreased from the voltage division to a stable voltage according to a first current and a second current flowing through the main switch set. Accordingly, it can decrease the time from initiating operation of the pump circuit to stabilizing the voltage of the control end, thereby it can increase the working efficiency of the PLL.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.