Driver circuit with output common mode voltage control
US6429700B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 17, 2001 |
| Grant date | Aug 6, 2002 |
| Priority date | — |
| Expiry date | Apr 17, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45702
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A driver circuit having a minimized and/or controllable output common mode voltage comprises a differential amplifier having, a passive element as a biasing source for establishing a bias current in the differential amplifier and a control amplifier operatively coupled to the differential amplifier in a feedback arrangement, the control amplifier generating a control signal. The differential amplifier is responsive to the control signal for providing a voltage at an output of the driver circuit that is substantially independent of an input signal presented to an input of the driver circuit. By eliminating the need for an active device (e.g., transistor) as a bias current source, the output common mode voltage of the driver circuit is minimized. A reference signal coupled to the control amplifier, in conjunction with the feedback arrangement, substantially fixes the output common mode voltage of the driver circuit to a predetermined value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.