Digital full range rotating phase shifter
US5451894A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 24, 1993 |
| Grant date | Sep 19, 1995 |
| Priority date | — |
| Expiry date | Feb 24, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/0337
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The use of three identical delay line circuits enables one of said delay circuits to be connected as a minimum delay reference and a second delay circuit to then be continuously compared to said minimum delay reference delay circuit to provide a code which calibrates the second delay line circuit by indicating and controlling continuously the length of the second delay line circuit to provide an exactly 360-degree phase shift of the reference signal under variable temperatures, pressures and voltages. Then, by maintaining the length of the third identical delay line at said determined 360-degree length, and by being able to select any tap output of the third identical delay line circuit responsive to a command, the third delay line circuit provides an adjustable, feedback calibrated, delay line circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.