Charge pump and active loop filter with shared unity gain buffer
US10756739B1 · kind B1 · utility
3Cited by
4References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 29, 2019 |
| Grant date | Aug 25, 2020 |
| Priority date | — |
| Expiry date | Mar 29, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/0896
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A unity gain buffer is shared by a charge pump and an active loop filter in a phase-locked loop. The charge pump uses the unity gain buffer to reduce current mismatch in the charge pump and the active loop filter uses the unity gain buffer in a circuit that increases the effective capacitance of the active loop filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.