Commissariat a L'energie Atomique Et Aux Energies Alternatives

Patrick Wurm

Alexandre Shirakawa

Claire Auer (Wurm), Legal Representative

Jean-Baptiste David

A device for processing a signal carrying information to be transmitted using a radiofrequency signal, for transformation of the signal into two signals of identical amplitude phase-shifted respectively relative to the information-carrying signal according to two variable and opposing phase shifts. The device includes a mechanism transforming the information-carrying signal. The device transforms the information-carrying signal into two signals of constant amplitude and of variable phase shifts according to values of the information-carrying signal, for as long as the amplitude of the information-carrying signal is greater than a predetermined value, and transforms the information-carrying signal into two signals of variable amplitude according to the values of the information-carrying signal, when the amplitude of the information-carrying signal is less than the predetermined value.

Signal processing device and method, radiofrequency transmission system including such a device

The invention relates to a radiofrequency transmission system comprising: means of producing at least one digital signal quantized on N bits; for each of said at least one digital signal, digital processing means including: Sigma-delta filters capable of producing, on the basis of a digital input signal quantized on N bits, a digital output signal quantized on M bits, where M is less than N; downstream from sigma-delta filters, means of repetition over-sampling; and downstream from over-sampling means, convolution means; digital-to-analogue conversion means capable of converting a digital output signal into an analogue signal; and analogue filtering means capable of filtering said analogue signal so as to select a narrow frequency band which includes the second frequency.

Radiofrequency transmission system

Radiofrequency transmission system including a digital module producing a first complex digital signal quantised on N bits, a module transforming the first complex digital signal into two second complex digital signals with an identical and constant envelope that are phase-shifted with respect to one another, sigma-delta filters quantising the two second signals into third M bits signals, M being less than N, a digital-to-analogue converter converting the third signals into analogue signals, band-pass filters selectively filtering the analogue signals in a predetermined transmission frequency band, amplifiers amplifying the filtered analogue signals, and filters recombining the amplified analogue signals for transmission.

Outphasing amplification of digital modulated signals in a radiofrequency transmission system

A power amplifier filter for radio-frequency signals having an outphasing type architecture comprising a first stage () capable of generating, from an input signal s(t), two signals s(t), s(t) having an identical amplitude but phase shifted relative to each other, a second amplifier stage () for said signals s(t), s(t), and a third recombining stage () capable of summing the two signals s'(t), s&#x2032;(t) obtained from second stage (), characterized in that recombining stage () includes an assembly of acoustic wave resonators coupled to each other, some of these resonators referred to as 'input resonators' being connected to the outputs of second stage () and others of these resonators referred to as 'output resonators' being connected to the output terminals of the filter.

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Voreppe, France

Patrick Wurm