Output buffer driver with load compensation
US5748019A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 15, 1997 |
| Grant date | May 5, 1998 |
| Priority date | — |
| Expiry date | May 15, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/00384
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A circuit for producing a buffered output includes a power source, a ground, a circuit input, a circuit output, a voltage reference source, a current control pre-driver and an output driver. The circuit input receives an input signal. The circuit output produces an output signal. The voltage reference source generates a reference voltage. The current control pre-driver includes a first current source, a second current source, and control logic. The first current source is connected to the power source and has a first control input. The second current source is connected to the ground and has a second control input. The control logic is connected to the circuit input, to the voltage reference source, to the first control input of the first current source and to the second control input of the second current source. In response to a first voltage value of the input signal on the circuit input, the control logic turns off the second current source and turns on the first current source. The first current source is turned on by connecting the reference voltage to the first control input of the first current source. In response to a second voltage value of the input signal on the circuit…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.