Frequency synthesizer and multiplier circuit arrangement for a r

Details Frequency synthesizer and multiplier circuit arrangement for a r Frequency synthesizer and multiplier circuit arrangement for a r

1993-07-26

1995-11-28

Pham, Chi H.

Telecommunications

Transmitter and receiver at same station

With frequency stabilization

455 87, 455112, 4551803, 4551831, 4551882, 455260, H04B 150

Patent

active

054716527

ABSTRACT:
The invention relates to a general purpose circuit arrangement for a radio telephone wherein the universal application possibilities have been provided by phase-locked circuits (PLL1 to PLL3) and by a multiplier circuit (11, 12) that can be controlled (signals Select x1/x2 and Synte sel./Data) by the processor of the mobile telephone. The second harmonic or the fundamental frequency is selected by the multiplier circuit from the VCO oscillators (61, 62). In this way, the frequencies of the synthesizer circuits (UHF1, UHF2, UHF3) can be set independently of each other and according to the requirements of the respective cellular networks. The central circuits are advantageously integrated into four IC circuits (IC1 to IC4).

REFERENCES:
patent: 4377871 (1983-03-01), Borras et al.
patent: 4969210 (1990-11-01), Hansen et al.
patent: 5175729 (1992-12-01), Borras et al.
patent: 5392460 (1995-02-01), Mattila
Forrester, T. D. , "Synthesized FM Transceiver", Wireless World, vol. 83, No. 1503, pp. 84-86, Nov. 1977.
Patent Abstracts of Japan, vol. 6, No. 16 (E-92) Jan. 29, 1982 and JP-A-56 136 041 (Sanyo Electric Co. Ltd.).
Japan Telecommunication Review, vol. 24, No. 2, Apr. 1982, Tokyo, Japan pp. 148-156 "Improved Land Mobile Telephone Equipment".

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