Input interface circuit for removing noise components of an input signal
US5300820A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 1993 |
| Grant date | Apr 5, 1994 |
| Priority date | — |
| Expiry date | Feb 4, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K5/1252
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Each channel of an input interface circuit for suppressing noise contained in input signals to a CPU (microcomputer) of an automobile includes: a level determining circuit for shaping the waveform; a clock circuit for generating sampling clock pulses; a sequential memory circuit, clocked by the clock pulses, for sampling the output levels of the level determining circuit and storing at least two successive output levels; and a resetting circuit which is set when all the levels stored in the sequential memory circuit are high, and which is reset when all the levels stored in the sequential memory circuit are low. The noise pulses contained in the output of level determining circuit are thus effectively removed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.