Dual-mode baseband controller for radio-frequency interfaces rel

Details Dual-mode baseband controller for radio-frequency interfaces rel Dual-mode baseband controller for radio-frequency interfaces rel

1994-02-04

1997-06-10

Coles, Sr., Edward L.

Pulse or digital communications

Transmitters

Quadrature amplitude modulation

375261, 375267, 375299, H04L 2704

Patent

active

056384050

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.

REFERENCES:
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patent: 5446757 (1995-08-01), Chang
Schultes et al, Frequenz, vol. 46 No. 11 pp. 280-284, "Comparison of GMSK Modulators for DECT-Cordless Telephones".

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