Input converter
US4063121A · kind A · utility
7Cited by
4References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 22, 1976 |
| Grant date | Dec 13, 1977 |
| Priority date | — |
| Expiry date | Jul 22, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K3/0377
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An input converter circuit for producing a logic level indication of the on or off condition of an input. The input may be AC or DC at any reasonable level. A bilateral photocoupler output is applied to an operational amplifier integrator, which establishes the integration time of the signal. The amplifier output is coupled to a Schmitt trigger having threshold levels at about one third and two thirds of the power supply voltage. The output of the Schmitt trigger provides a logic one output if there is an input signal present and a logic zero output otherwise.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.