Apparatus and methods for improved control of quiescent state of output transistors in a class AB amplifier
US6369653B1 · kind B1 · utility
9Cited by
2References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 9, 2000 |
| Grant date | Apr 9, 2002 |
| Priority date | — |
| Expiry date | May 9, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/453
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A class AB amplifier biasing circuit is provided for controlling the quiescent state of a pull-up output device and a complimentary pull-down output device. The biasing circuit includes first and second current sources, each having a floating resistor configured to supply current to the pull-up and pull-down devices, respectively. The biasing circuit also includes gate control circuits for controlling the gate voltages of the first and second floating resistors. A device replica transistor is connected to a voltage node associated with the gate of the either the pull-up device or the pull-down device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.