Dual-mode baseband controller for radio-frequency interfaces relating to digital cordless telephones
US5638405A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 1994 |
| Grant date | Jun 10, 1997 |
| Priority date | — |
| Expiry date | Feb 4, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/72502
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A dual-mode baseband controller enables a single integrated circuit to support either In-Phase Quadrature (I-Q) or Non-Return to Zero (NRZ) radio-frequency transmitter architectures for use in second generation (CT2) cordless telephones. A radio frequency (RF) interface circuit controls output signals to support either the I-Q architecture or the NRZ architecture, depending on a MODE control bit received from a controlling integrated circuit. The RF interface circuit comprises an I-Q waveform generator, four multiplexers, two digital-to-analog converters, a buffer, interconnecting circuitry, and a timing controller operating under configurable software control.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.