Modulated charge pump with uses an analog to digital converter to compensate for supply voltage variations
US6424570B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 26, 2001 |
| Grant date | Jul 23, 2002 |
| Priority date | — |
| Expiry date | Jun 26, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/073
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A system is described for generating a charge pump voltage for flash memory operations, wherein a supply voltage detection circuit (e.g., analog to digital converter, digital thermometer) is configured to detect a supply voltage value and generate one or more supply voltage level detection signals associated therewith. The system further includes a charge pump circuit comprising one or more stages operable to receive a supply voltage and generate the charge pump output voltage having a value greater than the supply voltage, and a charge pump compensation circuit operably coupled to the supply voltage detection circuit and the charge pump circuit. The charge pump compensation circuit is operable to receive the one or more output signals from the supply voltage detection circuit and modulate a capacitive loading associated with the charge pump circuit based on the one or more output signals, thereby creating an improved low power charge pump which uses a modulated pumping capacitance to compensate for fluctuations of the input power supply (for example, VCC), to produce a slow ripple and low noise output which may be used as a pumped voltage for various mode operations (e.g., erase, …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.