Series capacitor charge pump with dynamic biasing
US6028473A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 19, 1996 |
| Grant date | Feb 22, 2000 |
| Priority date | — |
| Expiry date | Mar 19, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/075
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A charge pump apparatus which comprises first and second active capacitors in series, having a common node between them. The second node of the second active capacitor is coupled to a particular node in the charge pump which drives an output of the charge pump. A pump clock is connect to the first lead of the first active capacitor. A voltage clamp is connected to the particular node and provides a bias point. A dynamic biasing circuit is connected to the common node and charges the common node and the particular node during intervals between transitions of the pump clock to keep both the first and second active capacitors activated during the transitions of the pump clock. In a first embodiment, the first and second active capacitors comprise n-channel MOS devices, or equivalents, and the dynamic biasing circuit includes the precharge circuit responsive to a charge clock to pull up the common node during intervals in which the pump clock is low, and wherein the charge clock has transitions which are non-overlapping with transitions of the pump clock. Where the first and second active capacitors comprise p-channel MOS devices, or equivalents, the dynamic biasing circuit includes a …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.