Patent ID: 6434401
Filing Date: 2002-08-13
Classification: H04B

Abstract:
A method for the setting of a multiband telephony receiver comprising a radiation antenna (1), a transmission channel (2) and a reception channel (18) connected to this aerial, a first (3), second (4) and third (5) voltage-controlled oscillator respectively delivering a signal at a transmission frequency (FTX), a signal at a transition frequency (RFTX, RFRX), and a signal at an intermediate frequency (FITX), the signal at the transmission frequency being transmitted by the first oscillator to the antenna, a first mixer (8) connected at input to the outputs of the first and second oscillators and receiving, from this first oscillator, the signal at the transmission frequency and, from this second oscillator, the signal at the transition frequency, a comparator (10) connected at input to the output of the first mixer and to the output of the third oscillator, and delivering at output a control signal for the first oscillator, and between the first mixer and the comparator and, between the third oscillator and the comparator respectively, a first (14) and a second (13) frequency divider,characterized in that it comprises the following steps: a system of inequalities is set up taking account of a frequency-limited dynamic range of a single transition frequency oscillator so that this oscillator covers all the desired bands in transmission and reception, this system of inequalities possessing unknown quantities that are frequency ranges of this transition frequency oscillator and this intermediate frequency oscillator, the system of inequalities is resolved by choosing values of division of the frequency dividers below a predetermined number, the transmitter-receiver is set with solutions of the inequalities and by programming the dividers, and the first mixer is made to work in infradyne mode for one frequency band and in supradyne mode for another.