Digital time base with corrected analog interpolation
US4841497A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 7, 1987 |
| Grant date | Jun 20, 1989 |
| Priority date | — |
| Expiry date | Dec 7, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/11
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A digital time base with analog interpolation provides a variable reference voltage to assure that the period of an analog ramp between a zero value and a maximum value is equal to the time interval between range clock pulses. A time base error is determined by establishing a zero reference level on a test pulse rising edge corresponding to the zero value of the analog ramp, and then establishing a maximum level on the test pulse corresponding to the maximum value of the analog ramp initiated one clock pulse prior to the test pulse. The difference between the two levels on the test pulse represents the time base error. A microprocessor provides a corrected reference voltage as the maximum value so that the maximum delay of the analog ramp equals the time interval between clock pulses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.