Programmable voltage hysteresis on a voltage comparator
US5264740A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 11, 1993 |
| Grant date | Nov 23, 1993 |
| Priority date | — |
| Expiry date | Jan 11, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K3/02337
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A programmable voltage comparator having a programmable hysteresis function controlling the comparator's output relative to first and second comparator input voltage variables. The programmable voltage comparator comprises an inverting and non-inverting input for receiving a first and second input voltages and an output providing a logic state signal reflecting the amplitude of the inverting and non-inverting input voltages. The comparator includes level shift circuitry coupled to the inverting and non-inverting inputs for programmably shifting the amplitude of the voltages applied to the inverting and non-inverting inputs responsive to the logic state output of the comparator. In one embodiment, the comparator includes a differential amplifier having inverting and non-inverting outputs, wherein the level shift circuitry comprises a first level shift circuit coupled to the non-inverting voltage input and having a feedback element coupling to the non-inverting output. A second level shift circuit is coupled to the inverting input with a feedback element coupled to the inverting output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.