Patent Number: 6,434,401

Title: Method for the setting of a multiband mobile telephony transmitter-receiver and mobile telephone thus obtained

Abstract: To make a multiband transmitter-receiver without having to greatly increase the number of oscillators used for the modulation and demodulation of signals located in frequency bands that are very different from one another, a pair (13, 14) of programmable frequency dividers is used, installed in a transmission circuit comprising a transmission frequency oscillator (3, 30), a single transition frequency oscillator and an intermediate frequency oscillator. To go from a use (11) in one band to a use in another hand, it is enough, by means of a microprocessor (15), to modify the division coefficients of the programmable dividers by using infradyne and supradyne dividers.

Inventors: Recouly; Marc (Lierville, FR)

Assignee: Sagem SA

International Classification: H04B 1/40 (20060101); H04B 001/38 ()

Expiration Date: 08/13/2019