Common-mode controlled differential gain boosting
US6831501B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 13, 2003 |
| Grant date | Dec 14, 2004 |
| Priority date | — |
| Expiry date | Jun 13, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/242
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A current source circuit with common-mode differential gain boosting is provided. The current source circuit differentially provides first and second currents. The first current is produced by a first cascoded current source, and the second current is produced by a second cascoded current source. Each of the cascoded current sources comprises a current source transistor and a cascode transistor. The current source circuit has high output impedance utilizing gain-boosting techniques. A three-input differential amplifier forces a gate of the cascode transistor of each of the current source circuits to an approximately constant voltage. The three-input differential amplifier is configured to receive a bias signal. The current source circuit is arranged to servo both the gate and source of the cascode transistors in response to the bias signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.