Energy-efficient charge pump design for phase-locked loops
US10623007B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 8, 2019 |
| Grant date | Apr 14, 2020 |
| Priority date | — |
| Expiry date | Jan 8, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/0895
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An apparatus includes an oscillator circuit that may generate a clock signal with a frequency that is based on a voltage level of a control node, and a charge pump circuit that includes a first current source and a second current source. The first current source may be coupled between a first supply node and a first circuit node. The second current source may be coupled between a second supply node and a second circuit node. The charge pump circuit may be configured to pre-charge the first and second circuit nodes to voltage levels that differ from the control node and the first and second supply nodes. In addition, the charge pump circuit may select, based on phase information, either the first or second circuit node, and then modify, based on a voltage level of the selected circuit node, a voltage level of the control node.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.