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US 5,410,280 AGranted
Process and device for amplitude modulation of a radiofrequency signal
AssigneeThomson-CSF
InventorsLaurent Linguet, Philippe de Boisriou
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AssigneeThomson-CSF
InventorsLaurent Linguet, Philippe de Boisriou
Estimating the term…
The process according to the invention consists in breaking down a radiofrequency signal to be modulated according to a first and second signal, representing respectively the sum of the output voltages of identical amplitude of a first and second determined number of modules, with which respectively a first and second vector are associated whose respective amplitude and phase verify that the vectorial sum of the two vectors coincides with a determined reference that is used as a phase reference of the two vectors, in adapting the phase of the load impedance of each module so that vector associated with the current supplied by each of the amplifying modules is in phase delay in relation to their output voltages, in modulating the phase of the two signals by the modulation signal and in adding the first and second phase modulated signal to obtain a resultant amplitude modulated signal. Application: Medium wave radio broadcast transmitters.
Process for amplitude modulation of a signal, of the type consisting in modulating a radiofrequency output signal of a determined number of amplifying modules having transistors, by a modulation signal, said process consisting in breaking down the radiofrequency signal to be modulated according to at least a first and second signal, representing respectively the sum of the output voltages of identical respective amplitudes of a first and second determined number of modules, with which respectively a first and second vector are associated whose respective amplitudes and phases verify that the vectorial sum of the two vectors coincides with a determined reference that is used as a phase reference of the two vectors, and in modulating the respective phases of the two signals by the modulation signal and in adding the first and second phase modulated signal to obtain, after filtering, a resultant amplitude modulated signal.
Dependencies are inferred from the claim text.