Method and apparatus for all code testing
US5332996A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 30, 1993 |
| Grant date | Jul 26, 1994 |
| Priority date | — |
| Expiry date | Jun 30, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/12
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A device (12), such as an A/D converter for generating successive codes, each in accordance with the level of an input analog voltage, may be tested to determine if all codes have been generated by applying a voltage V.sub.t having an amplitude that varies between 0 and V volts. The variation in the voltage V.sub.t is such that when the device (12) is operating properly, it will generate all of its codes during a predetermined interval. Each code generated by the device (12) is compared by a comparator (18) to the count of an n-bit counter (20) whose count is initialized at zero. Each time the count of the counter (20) matches the code produced by the device (12), the counter is incremented. If the counter overflows (i.e., its count has exceeded 2.sup.n -1) within a prescribed interval, then the device (12) is said to be operating properly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.