Receiver with baseband I and Q demodulator
US6035005A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 10, 1997 |
| Grant date | Mar 7, 2000 |
| Priority date | — |
| Expiry date | Feb 10, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/3854
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A baseband demodulator receives inphase and quadrature signals I (116) and Q (117) representing a phase angle and amplitude. The demodulator (114) includes a discrete time continuous amplitude circuit (223, 253, 260) coupled to the quadrature generator to extract a sign information by processing the quadrature components (116 and 118). An accumulator 404 uses the sign information to manipulate predetermined phase angles stored at a memory component 402 to determine the phase angle carried by the I and Q components (116 and 118). As such, the need for up converters or complex analog-to-digital converters is eliminated in direct conversion receivers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.