Abstract: An in phase quadrature signal generator including a phase shifter (1) that receives at an input terminal (2) an input signal (Vin) supplied to phase shifting means (3,4) formed of passive elements, arranged for delivering at first and second output terminals, first (Out—I) and second (Out—Q) in phase quadrature signals. This generator is characterised in that it further includes, between the phase shifting means and the output terminals, transconductor means (11, 12) having a transconductance proportional to the passive elements, arranged so as to obtain a transfer function between said first and second in phase quadrature signals independent of said passive elements.

Abstract: The control circuit (1) allows the transconductance of at least one transistor (N1, N2) in conduction to be controlled. In order to do this, the circuit includes a transconductor block (2) which includes the transistor in conduction, a bias block (3) for biasing the transconductor block, and a load block (RL, RL?) receiving a load current provided by the transconductor block. The bias block includes a reference resistor (R0), so that the bias block supplies the transconductor block with at least one bias signal which depends upon the reference resistor to adjust the voltage between two current terminals of the transistor in conduction. In this manner, the transconductance value of the transistor in conduction is inversely proportional to the reference resistor value.

Abstract: The radiofrequency data signal reception device (1) includes at least two frequency conversion stages (2, 3) for converting radiofrequency data signals (RF1, RF2) of first and second different carrier frequencies into intermediate signals (SIF1, SIF2) with an identical frequency lower than the carrier frequencies of the radiofrequency signals. These intermediate signals are received by a channel selection unit (4) which can provide data signals (SI,Q) relating to the intermediate signals to a signal processing unit (6) for demodulation of the data signals. An oscillator stage (5) of the device provides oscillating signals (SO11, SO12, SO21, SO22) to the frequency conversion stages for the frequency conversion operations. The channel selection unit (4) includes an adder element (41) for adding the first and second intermediate signals, and a signal intensity indicator (43) checking the intensity level of the intermediate signals.

Abstract: An in phase quadrature signal generator including a phase shifter (1) that receives at an input terminal (2) an input signal (Vin) supplied to phase shifting means (3,4) formed of passive elements, arranged for delivering at first and second output terminals, first (Out_I) and second (Out_Q) in phase quadrature signals. This generator is characterised in that it further includes, between the phase shifting means and the output terminals, transconductor means (11, 12) having a transconductance proportional to the passive elements, arranged so as to obtain a transfer function between said first and second in phase quadrature signals independent of said passive elements.