Circuit for generating a reference voltage
US7046079B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 21, 2004 |
| Grant date | May 16, 2006 |
| Priority date | — |
| Expiry date | Jun 30, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F1/56
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A circuit for generating a reference voltage of an image sensor is provided. The circuit comprises a signal differential amplifier, a gain amplifier, a source follower and a clamp circuit. The signal differential amplifier is adapted for receiving and comparing a bias voltage and the reference voltage, and outputting a first voltage according to a comparison result. The gain amplifier is coupled to the signal differential amplifier, and is adapted for receiving the first voltage and outputting a second voltage. The source follower, coupled to the gain amplifier, and is adapted for receiving the second voltage and outputting the reference voltage. The clamp circuit is coupled to the source follower, and is adapted for receiving the reference voltage and limiting the reference voltage to below a clamp voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.