Programmable charge pump
US9634561B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 7, 2016 |
| Grant date | Apr 25, 2017 |
| Priority date | — |
| Expiry date | Jan 7, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/6871
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A charge pump includes a charge pump core circuit, a replica bias circuit, and a differential amplifier. The charge pump core circuit includes current source and sink circuits for charging and discharging an output node of the charge pump core circuit. The current source and current sink circuits are user programmable using bit signals to adjust a bandwidth and a phase margin of a phase-locked loop (PLL) that includes the charge pump. An impedance of the replica bias circuit varies based on the bit signals. The differential amplifier and the replica bias circuit form a feedback loop that reduces current mismatch between the current source and sink circuits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.