Programmable threshold data detection system
US4933869A · kind A · utility
Inventors
Key dates
| Filing date | Nov 18, 1988 |
| Grant date | Jun 12, 1990 |
| Priority date | — |
| Expiry date | Nov 18, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R19/0038
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A threshold detection circuit is provided for determining when a data input signal exhibits an amplitude which exceeds a first programmable threshold level, is less than a second programmable threshold level or between the first and second levels. Respective scaling circuits scale down the data input signal and a line voltage signal which is supplied to the circuit to generate a scaled data input signal and a scaled line voltage signal. The threshold detection circuit scales the first and second threshold levels by a predetermined factor. The scaled data input signal is compared with the scaled first and second threshold levels. In response to this comparison, the output of the circuit assumes a first logic state when the data input signal exceeds the first threshold level and assumes a second logic state when the data input signal exhibits an amplitude less than the first threshold level. The comparison is repeated for the second threshold level. A control processor correlates the threshold level with the appropriate logic states to identify the data signal magnitude with respect to the threshold levels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.