Differential gain boosting
US6930542B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 13, 2003 |
| Grant date | Aug 16, 2005 |
| Priority date | — |
| Expiry date | Jun 13, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45322
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A current source circuit with 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 because a voltage associated with a gate of the cascode transistor of the first cascoded current source and another voltage associated with a gate of a cascode transistor of the second cascoded current source are each forced to an approximately constant voltage by a differential amplifier. The drain voltage of the first and second current source transistors are each servoed to the saturation drain to source voltage of the first current source transistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.