Programmable frequency detector
US3990007A · kind A · utility
26Cited by
2References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 31, 1975 |
| Grant date | Nov 2, 1976 |
| Priority date | — |
| Expiry date | Mar 31, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R23/15
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A programmable frequency detector is provided for determining if the frequency of an input signal is above, below, or within a programmable tolerance of a programmable frequency. A counter circuit is provided that is enabled by a timing stage during a predetermined calculation period to count the input frequency; the counter output is then compared to a programmed frequency code input by a comparator stage. A latch circuit and the timing circuits then utilize the comparator output to determine if the input frequency was high, low, or within the pass tolerance band.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.