Constant voltage circuit
US8519782B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 23, 2011 |
| Grant date | Aug 27, 2013 |
| Priority date | — |
| Expiry date | Sep 28, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/242
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A current source generates a reference current. A first transistor is a depletion-type MOSFET arranged such that one terminal thereof is connected to the current source and its gate is connected to its source. A second transistor is an enhancement-type MOSFET arranged such that one terminal thereof is connected to the other terminal of the first transistor, the other terminal thereof is connected to a fixed voltage terminal, and its gate and drain are connected. A third MOSFET is an enhancement-type P-channel MOSFET arranged such that one terminal thereof is connected to the current source, the other terminal thereof is connected to the fixed voltage terminal, and its gate is connected to a connection node connecting the first and second transistors. A constant voltage circuit outputs at least a voltage that corresponds to the gate voltage of the third transistor or a voltage that corresponds to the gate voltage thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.