Charge pump system with reduced ripple and method therefor
US7279959B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | May 26, 2006 |
| Grant date | Oct 9, 2007 |
| Priority date | — |
| Expiry date | May 26, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A charge pump system has a charge pump for receiving a clock signal and provides an output signal of increased voltage magnitude in response to an enable signal. A plurality of comparators is coupled to the charge pump for detecting when the output signal is greater than a reference value. Each of the plurality of comparators is controlled by a respective different control signal derived from the clock signal and has differing phases. Detection circuitry is coupled to the plurality of comparators for providing the enable signal in response to detecting first leading rising edges and first leading falling edges of signals provided by the plurality of comparators. The interleaving operation of the comparators results in tighter regulation of the charge pump which reduces voltage ripple without significantly increasing capacitive load on the charge pump.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.