Radio architecture with dual frequency source selection

Details Radio architecture with dual frequency source selection Radio architecture with dual frequency source selection

1994-03-07

1995-11-07

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455 76, 455 84, 455 86, 370 691, 370 50, H04B 144, H04J 100

Patent

active

054654092

ABSTRACT:
A radio having two architectural platforms integrated in one integrated circuit (IC). A synthesizer controller (312) selects between an offset local oscillator (LO) synthesizer (318) and a second LO synthesizer (316) to provide a common architecture for either an Frequency Division Duplex (FDD) or Time Division Duplex (TDD) system design while providing isolation between the two frequency sources. An offset LO signal (319) is translated to an isolated LO signal 310 and combined with a main LO signal (322) to provide the FDD platform. A second LO signal (314) is translated into the isolated LO signal 310 and combined with the main LO signal (322) to provide the TDD platform. The second LO synthesizer signal (314) is common to both systems in the receive mode.

REFERENCES:
patent: 4596940 (1986-06-01), Schuppan et al.
patent: 5083048 (1992-01-01), Kashimura
patent: 5153457 (1992-10-01), Martin et al.
patent: 5179721 (1993-01-01), Comroe et al.
patent: 5281632 (1993-07-01), Yamao et al.
patent: 5293081 (1994-03-01), Chiao et al.
"Basic Gain Stages," Bipolar and MOS Analog and Integrated Circuit Design, Alan B. Grebene, Chapter 5, pp. 215-216. Wiley Inter-Science, 1984.

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