Stmicroelectronics S.a.

St-ericsson Sa

Stmicroelectronics (grenoble 2) Sas

Benoit Butaye

Luc Garcia

Thierry Lapergue

Mathilde Sie

Jerome Lajoinie

Frederic Duez

A transmitter/receiver device include an antenna, a voltage source, a radio frequency receiver connected to the antenna and powered by the voltage source, a radio frequency transmitter connected to the antenna and powered by the voltage source, and a switch coupled to the antenna, the receiver and the transmitter and configured to couple/decouple the antenna from the transmitter or from the receiver. The antenna is shared between the transmitter and the receiver. The receiver includes a radio frequency stage that includes an amplifier device having an input coupled to the antenna. The amplifier device includes an amplifier switch configured to connect or disconnect the amplifier device from the voltage source.

Transmitter / receiver device

A frequency conversion device for transforming a frequency of an input signal, the device comprising: a signal generator for providing a plurality N of first signals at a first frequency, where N&#x2267;1, from an input signal having an in-phase component I and a quadrature signal component Q; an oscillator for generating N parallel oscillation signals, wherein the N oscillation signals are stepped in phase with respect to one another; a mixer comprising N mixing components, each mixing component being coupled to receive a respective one of the plurality of first signals and coupled to receive a respective oscillation signal for mixing the respective first signal with the corresponding oscillation signal to provide an output signal; and a common amplifier for receiving the N output signals from the N mixing components in N sequential phases for transmission.

Frequency conversion device for wireless systems

The present invention includes a mixer circuit integrating a voltage-to-currrent conversion in the same stage. A mixer deviceof a transmission system comprises a pair of transistorsandforming a differential circuit having two differential inputs receiving a carrier V, two differential current outputs delivering a differential output current and a common current output whose current is equal to the sum of the differential output currents; a current-to-voltage conversion elementcoupled to the common current output of the pair of transistors; an amplifierhaving a positive input receiving the modulating signal, a negative feedback input coupled to the current-to-voltage conversion element, and an output coupled to each of the differential inputs of the pair of transistors.

Digital modulation signal mixer

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Meylan, France

Benoit Butaye