Output driver having output impedance adaptable to supply voltage and method of use
US9419588B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 21, 2015 |
| Grant date | Aug 16, 2016 |
| Priority date | — |
| Expiry date | Feb 21, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/00384
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An output driver is provided that adapts an output impedance of the output driver to the voltage level of a power supply, thereby providing a constant output impedance over a range of different operating voltages. The output driver includes a plurality of individual driver circuits, each one of the plurality of individual driver circuits configured to provide a plurality of predetermined output impedances in response to a plurality of power supply voltage level inputs and a decoder. The decoder of the output driver is configured for receiving a digital codeword representative of a voltage level of a power supply coupled to the output driver and for decoding the digital codeword to activate one or more of the individual driver circuits to provide a constant output impedance from the output driver in response to the voltage level of the power supply coupled to the output driver, wherein the constant output impedance is a combination of the predetermined output impedances of the activated individual driver circuits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.