Abstract: In one embodiment, system for driving an electromagnetic appliance includes an electromagnetic appliance, a main-drive unit and a sub-drive unit. The electromagnetic appliance includes coils for n number of phases, the coils for each of the n phases being arranged in a pair and wound so as to be excited in a predetermined direction by being energized with opposite-phase currents. The main drive unit is connected to each of the coils and energizes the paired coils with opposite-phase currents. The sub-drive unit is provided parallel with the main-drive unit and is configured to suppress a short-circuit current occurring at the main-drive unit when switching energization of the coils.

Abstract: In one embodiment, system for driving an electromagnetic appliance includes an electromagnetic appliance, a main-drive unit and a sub-drive unit. The electromagnetic appliance includes coils for n number of phases, the coils for each of the n phases being arranged in a pair and wound so as to be excited in a predetermined direction by being energized with opposite-phase currents. The main drive unit is connected to each of the coils and energizes the paired coils with opposite-phase currents. The sub-drive unit is provided parallel with the main-drive unit and is configured to suppress a short-circuit current occurring at the main-drive unit when switching energization of the coils.

Abstract: There is disclosed a linearizer in which a main signal inputted to a main amplifier is orthogonally modulated by an orthogonal modulator to allow an upper side band signal or a lower side band signal to appear, the signal is used to perform a distortion compensation control, and a constitution of a side band signal detector is thereby simplified. When a phase of a base band signal from a modulated signal generator is reversed in time division, an appearance position of the side band signal is changed to a lower side from an upper side, or to an upper side from a lower side. Moreover, when the phase of the base band signal is changed at high speed, an amplification property is controlled at high speed.

Abstract: There is disclosed a linearizer in which a main signal inputted to a main amplifier is orthogonally modulated by an orthogonal modulator to allow an upper side band signal or a lower side band signal to appear, the signal is used to perform a distortion compensation control, and a constitution of a side band signal detector is thereby simplified. When a phase of a base band signal from a modulated signal generator is reversed in time division, an appearance position of the side band signal is changed to a lower side from an upper side, or to an upper side from a lower side. Moreover, when the phase of the base band signal is changed at high speed, an amplification property is controlled at high speed.

Abstract: The present invention provides a detector comprising a microstrip line having one end being grounded and another end connected to a main transmission line, a detection diode connected to the microstrip line, and a smoothing circuit for smoothing a signal detected by the detection diode.