Quadrature signal generator and method therefor
US6157235A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1999 |
| Grant date | Dec 5, 2000 |
| Priority date | — |
| Expiry date | Jun 1, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H11/22
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A quadrature generator (100) includes a phase detector (125) having a set of differential inputs for coupling in-phase and quadrature signals (114,116) and a set of differential outputs for providing a phase error signal (135). Switches (122,127) are associated with the set of input terminals and with the set of output terminals. The switches (122,127) are synchronously controlled to switch around the signals at the input terminals and at the output terminals in concert, and in rapid succession. The operation of the switches (122,127) eliminates or reduces the effects of imperfections within the parallel paths of the phase detector circuitry (125), in order to produce a more accurate phase deviation signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.