Device for measuring the phase angle between a sine wave signal and a cyclic logic signal of the same frequency
US4506333A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 21, 1982 |
| Grant date | Mar 19, 1985 |
| Priority date | — |
| Expiry date | Jul 21, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R25/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
According to the invention, on the basis of a logic signal of frequency F a multiplier processes a signal of frequency 4F sampling a A/D converter, which supplies at its outputs the digital values and a bit representing the sign of sin .0. and cos .0.. These values, processed by a circuit, are restored by two registers, which supply the absolute values of A sin .0. and A cos .0.. These values are compared in a comparator and as a function of the ratio .vertline.sin .0..vertline./.vertline.cos .0..vertline. an inverting PROM and a multiplier calculate either .vertline.tan .0..vertline. or .vertline.cot .0..vertline.. The phase angle .0. is extracted by a PROM knowing .vertline.tan .0..vertline. or .vertline.cot .0..vertline. and the sine and cosine signs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.