Abstract: A generator of a high-power modulated signal, a method for calibrating the generator, and a magnetic resonance imaging system. The generator includes means for generating a sinewave signal phase-shifted by a first variable value relative to a phase reference and a sinewave signal phase-shifted by a given fixed value added to a second variable value relative to the phase reference, the second variable value opposite to the first variable value relative to the phase reference, the variable values representative of the modulation of the radiofrequency signal, the two sinewave signals being of constant amplitude, two amplifiers each amplifying one of the sinewave signals in a congested regime, and a fixed phase shifter with a value equal to the given value of the means to generate the two sinewave signals, the fixed phase shifter coupling the signals originating from the two amplifiers to deliver the modulated radiofrequency signal.

Abstract: The invention relates to a device for coupling individual high-frequency amplifiers (M1, M2, . . . Mn) operating at a frequency f, including n high-frequency inputs E1, E2, . . . Ei, . . . Ep, . . . En, n being an integer greater than 1, i and p being two integers between 1 and n, p being different from i, and a power high-frequency output (S) to supply a load (R) with a power which is the sum of the powers supplied by all the individual amplifiers connected via their power outputs to said high-frequency inputs. The coupling device includes n inductors L1, L2, Li, . . . Lp, . . . Ln connected by one of their ends to a respective high-frequency input, their other ends being connected together to one end (B) of an output capacitor (Cs) the other end of which is connected to the high-frequency output (S) in order to form as many series resonant LC circuits, resonating at the operating frequency f, between the inputs E1, E2, . . . Ei, . . . Ep, . . .

Abstract: A generator of a high-power modulated signal, a method for calibrating the generator, and a magnetic resonance imaging system. The generator includes means for generating a sinewave signal phase-shifted by a first variable value relative to a phase reference and a sinewave signal phase-shifted by a given fixed value added to a second variable value relative to the phase reference, the second variable value opposite to the first variable value relative to the phase reference, the variable values representative of the modulation of the radiofrequency signal, the two sinewave signals being of constant amplitude, two amplifiers each amplifying one of the sinewave signals in a congested regime, and a fixed phase shifter with a value equal to the given value of the means to generate the two sinewave signals, the fixed phase shifter coupling the signals originating from the two amplifiers to deliver the modulated radiofrequency signal.

Abstract: The invention relates to a device for coupling individual high-frequency amplifiers (M1, M2, . . . Mn) operating at a frequency f, including n high-frequency inputs E1, E2, . . . Ei, . . . Ep, . . . En, n being an integer greater than 1, i and p being two integers between 1 and n, p being different from i, and a power high-frequency output (S) to supply a load (R) with a power which is the sum of the powers supplied by all the individual amplifiers connected via their power outputs to said high-frequency inputs. The coupling device includes n inductors L1, L2, Li, . . . Lp, . . . Ln connected by one of their ends to a respective high-frequency input, their other ends being connected together to one end (B) of an output capacitor (Cs) the other end of which is connected to the high-frequency output (S) in order to form as many series resonant LC circuits, resonating at the operating frequency f, between the inputs E1, E2, . . . Ei, . . . Ep, . . .

Abstract: An excitation stage having a predetermined number of semiconductor-based amplification modules parallel-connected at the input of a coupling device to couple the outputs of the amplification modules to the input of the transmission tube, as well as a diode-based limiter device positioned inside the coupling device to limit the pulses that short-circuit electrodes of the transmission tube appearing at the output of the coupling device.

Abstract: A digital circuit having a first section for converting a low-frequency signal into a sampled single sideband signal, coupled to a second section for separating the sampled SSB signal into its two components, the phase and envelope components.