Slew rate control of a charge pump
US7348829B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 2006 |
| Grant date | Mar 25, 2008 |
| Priority date | — |
| Expiry date | Apr 27, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A charge pump system including a clock circuit and a charge pump circuit is provided. The clock circuit provides a first clock with a frequency based on a memory block select signal indicative of load capacitance of a charge node. The charge pump circuit receives the first clock and charges the charge node at a rate based on the frequency of the first clock and the load capacitance of the charge node. The memory block select signal indicates which of the memory blocks are coupled to the charge node and thus indicates the load capacitance of the charge node. The frequency of the first clock is adjusted based on the load capacitance of the selected block so that the slew rate of the charge node is about the same. Thus, the slew rate of the voltage ramp on the charge node is about the same regardless of the load capacitance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.