Temperature-insensitive current controlled CMOS output driver
US5929654A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 10, 1997 |
| Grant date | Jul 27, 1999 |
| Priority date | — |
| Expiry date | Jul 10, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/09429
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A circuit for selectively generating one of three voltage level as an output has a pull-up transistor and a pull-down transistor. The circuit includes a bias voltage source for generating a constant voltage signal; a temperature compensating constant-current source for outputting variable voltage signal corresponding to a temperature change; a tri-state control circuit for receiving a data signal to generate a control signal based on the data signal; and a switching circuit, in response to the control signal, for selectively the bias voltage source and the temperature compensating constant current source to the pull-up and pull-down transistors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.