High-voltage selecting circuit which can generate an output voltage without a voltage drop
US8120984B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 23, 2010 |
| Grant date | Feb 21, 2012 |
| Priority date | — |
| Expiry date | Oct 28, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/005
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A high-voltage selecting circuit generates an output voltage with no voltage drop by means of an auxiliary NMOS transistor turning on the corresponding selecting PMOS transistor of the high-voltage selecting circuit when the voltage levels of a first input voltage and a second input voltage are equal. In addition, when one of the first input voltage and the second input voltage is higher than the other one, the high-voltage selecting circuit avoids the leakage current by means of an auxiliary PMOS transistor turning off the corresponding selecting PMOS transistor of the high-voltage selecting circuit. In this way, the high-voltage selecting circuit can correctly generate the output voltage according to the first input voltage and the second input voltage, and avoid the leakage current at the same time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.