Generator for supplying reference voltage and reference current of stable level regardless of temperature variation
US7233195B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 6, 2005 |
| Grant date | Jun 19, 2007 |
| Priority date | — |
| Expiry date | Jun 7, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/30
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A reference voltage and reference current generator supplies a reference voltage and a reference current, both having stable levels regardless of temperature variation. The reference voltage and reference current generator includes a reference voltage generating unit, a first current mirror, a temperature compensation MOS transistor and a second current mirror. The reference voltage generating unit outputs a reference voltage having a stable level regardless of temperature variation and process variation by using junction voltage characteristic and thermal voltage characteristic of a bipolar transistor, and supplies an inner current corresponding to the thermal voltage characteristic. The first current mirror supplies a first current by mirroring the inner current. The temperature compensation MOS transistor supplies a second current corresponding to the reference voltage through the source-drain stage. The second current mirror supplies a reference current corresponding to the sum of the first current and the second current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.