Stmicroelectronics S.a.

Bruno Pellat

Jean-Charles Grasset

Eric Andre

Frédéric Rivoirard

Daniel Saias

Florent Sibille

Davy Thevenet

Sylvie Gellida

A radio signal receiver includes an input for receiving an input signal having an input carrier frequency modulated by a payload signal to be detected. A frequency converter changes the carrier frequency of the input signal and produces an intermediate signal that is an image of the input signal, and has a carrier frequency equal to an intermediate frequency. A filter circuit filters the intermediate signal. A demodulator eliminates a component, with a frequency equal to the intermediate frequency, from the filtered intermediate frequency, and produces the payload signal. The receiver also includes a detection circuit to produce a level signal representative of a level of the payload signal. A control circuit applies a control signal representative of the level signal to a control input of the frequency converter, the filter circuit and the demodulator.

Intermediate-frequency type radio signal receiver

A direct conversion type of frequency transposition device includes a transconductor block receiving the input signal and a current switching block connected to the output from the device. At least the common mode (I+I) is servocontrolled to static output currents from the frequency transposition device on a current proportional to a reference current (I) and independent of the static output currents from the transconductor block.

Process for control of standby currents in a direct conversion type of frequency transposition device, and corresponding device

A transconductance stage includes at least one principal bipolar transistor having a base linked to an input terminal, a collector linked to an output terminal, and an emitter linked to a supply terminal through a resistor. At least one bipolar compensation transistor is connected in parallel to the principal transistor and linked without going through the resistor to the supply terminal. The value Rof the resistance is chosen so that R*I&#x3e;V/2, where Vis the thermal voltage and Iis the quiescent current of the principal transistor.

Transconductance stage and device for communication by Hertzian channel equipped with such a stage

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Bruno Pellat