Circuit for controlling field effect device transconductance
US6828831B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 30, 2003 |
| Grant date | Dec 7, 2004 |
| Priority date | — |
| Expiry date | May 30, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/78
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A transconductance control circuit includes a master device having first and second field effect devices coupled to respective first and second current sources, a reference device coupled to a third current source, and comparison circuitry. The comparison circuitry includes at least first, second and third inputs and at least one output, with the first input configured to receive a reference signal associated with the reference device, the second and third inputs coupled to respective terminals of the first and second field effect devices, and the output coupled to current control inputs of one or more of the current sources. The transconductance control circuit provides a feedback control arrangement in which, for example, the comparison circuitry output is utilized to adjust one or more of the current sources such that a difference signal Vg between voltages at the respective terminals of the first and second field effect devices converges to a reference signal VR. As a result, the transconductance gm of the first field effect device converges to the conductance of the reference device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.