Method and circuit for triggering an electronic instrument only once during a period of a signal
US5223784A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1991 |
| Grant date | Jun 29, 1993 |
| Priority date | — |
| Expiry date | Jun 1, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R13/32
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and circuit for triggering an electronic instrument only once during a period of an input signal having multiple triggering events during that period. A signal applied to an electronic instrument, such as an oscilloscope, is acquired. Qualified triggering events occurring on the acquired signal are identified. A selected one of the qualified triggering events during the period of the applied signal causes a trigger signal output to occur, while other qualified triggering events are ignored. In the preferred embodiment a triggering event is qualified by a first comparator that compares the input signal to a first reference level and produces a predetermined logic level output if the input signal bears a predetermined relationship to the reference level. When a qualified triggering event occurs, a buffer amplifier applies the predetermined logic level to charge a capacitor, which thereafter stores some energy from the input signal and applies it to a comparator for a predetermined period of time. The comparator compares the voltage on the capacitor to a second reference level and produces a pulse if the capacitor voltage has a predetermined relationship to the second referen…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.