Hysteresis comparator circuit for use with a voltage regulating circuit
US5739705A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 15, 1996 |
| Grant date | Apr 14, 1998 |
| Priority date | — |
| Expiry date | Nov 15, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/267
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A hysteresis comparator circuit using, for a virtually power-free detection of the voltage value to be subjected to a comparison, a differential stage utilizing on one end load transistors and on the other hand a negative feedback stage and preferably a current mirror stage. The control electrode of one load transistor is fed with the voltage to be used for the comparison. The control electrode of the other load transistor is fed with a reference voltage on the basis of which this load transistor forms a constant load impedance. The second load transistor has a third load transistor connected in parallel thereto, which in response to the output signal of the comparator is either conducting or blocking, so that in accordance with the output signal of the comparator, an additional load impedance is connected in parallel to the impedance of the second load transistor or no such connection is made.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.