Efficient differential charge pump with sense and common mode control
US10361707B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 29, 2017 |
| Grant date | Jul 23, 2019 |
| Priority date | — |
| Expiry date | Nov 29, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/093
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A system and apparatus relating to a differential charge pump circuit for use in a phase-locked loop (PLL) circuit. A differential charge pump circuit can include a reference current, two sense amplifiers, a common mode control amplifier, and an h-bridge circuit. The h-bridge circuit is coupled to the reference current and the common mode control amplifier. The reference current drives a first portion of the h-bridge circuit and the common mode control amplifier controls a second portion of the h-bridge circuit. The h-bridge circuit also includes first and second nodes. The nodes are inputs to one of the sense amplifiers. The differential charge pump circuit is configured to control a voltage at the first node so that it is substantially equal to a voltage at the second node for a plurality of voltages at the second node. The differential charge pump circuit can also include a transistor with a gate coupled to an output of a sense amplifier. The voltage at the first node can be controlled by the sense amplifier and the transistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.