Voltage comparator with hysteresis
US5446396A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 22, 1992 |
| Grant date | Aug 29, 1995 |
| Priority date | — |
| Expiry date | Oct 22, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K3/3565
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An improved comparator circuit is provided for comparing two input signals and producing a resulting digital output. The comparator circuit uses a single cascode devices and current mirror circuit parallel coupled to two differential amplifier stages. One differential amplifier stage receives differential input signals and the other differential amplifier stage receives a variable reference voltage and a feedback voltage from the output of the comparator. The reference voltage is varied according to user requirements. The reference voltage can be varied to any voltage within the range of the input signals placed on the differential amplifier stage. Hysteresis differential voltage on the input differential amplifier stage can be accurately controlled by varying the biasing current and reference voltage placed on the hysteresis differential amplifier stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.