Charge pump circuit with dynamic biasing of pass transistors
US7248096B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 22, 2004 |
| Grant date | Jul 24, 2007 |
| Priority date | — |
| Expiry date | Jan 20, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/077
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A two-phase charge pump is provided that is controlled by first and second clock signals in phase-opposition. The charge pump has a sequence of cascade-connected stages. Each stage includes a capacitive element driven by one clock signal such that capacitive elements of adjacent stages are driven by different clock signals, a pass transistor that transfers electric charge to the capacitive element from the capacitive element of a previous stage, a first biasing circuit that enables the pass transistor during a first phase of the one clock signal, and a second biasing circuit that disables the pass transistor during a second phase of the one clock signal. Also provided is a two-phase charge pump having two branches that each include a sequence of such cascade-connected stages, with each stage of one branch having a corresponding stage in the other branch. A method of operating two-phase charge pumps is also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.