System and method for switching between a first supply voltage and a second supply voltage of a load
US9136733B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 2011 |
| Grant date | Sep 15, 2015 |
| Priority date | — |
| Expiry date | Jul 10, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/14
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A system switches between application of a first supply voltage and a second supply voltage to a load. The second supply voltage is a regulated voltage that is generated from the first supply voltage, or is alternatively generated from a reference voltage, such as bandgap. When the load is supplied from the first supply voltage, the regulated voltage is also generated from the first supply voltage. At or after switching the load to the second supply voltage, the regulated voltage is generated instead from the reference voltage. The load is a clock circuit, such as an oscillator. The controlled switching of the supply voltage for the load in the manner described addresses concerns over introducing errors in the output clock signal when the clock circuit's supply voltage is changed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.