Voltage level detecting circuit
US4424457A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 20, 1981 |
| Grant date | Jan 3, 1984 |
| Priority date | — |
| Expiry date | May 20, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04C10/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A voltage level detector circuit, which enables an input voltage to be compared with a predetermined stable reference level, defined on the basis of the sum of a first value of the direct voltage across the terminals of a diode and of the product of the difference between this first value and a second value of the voltage across the terminals of the diode by a predetermined coefficient, comprises substantially identical bipolar transistors (1, 2), connected as diodes, in series with current sources (3, 4) for generating voltages representative of these first and second values, a capacitive calculating circuit (5-8) which produces a signal representative of the algebraic value of the difference between the input voltage and the reference level and an amplifier (9) for bringing this signal to a logic level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.