Amplitude modulation system

Abstract

Abstract PURPOSE:To improve efficiency of a modulator, by switching and operating series modulating circuits alternately according to component of the modulation signal. CONSTITUTION:Since the modulation signal input through capacitor 42 is shifted in resistance 41 by power source voltage components and is applied to diode 40, negative components of the modulation signal are applied to the gate of FET32 for modulation, and the conduction degree of FET32 is controlled during this time. Therefore, amplifier 35 is subjected to series modulation. Positive components of the modulation signal are applied to the gate of FET33 by the action of diode 44 to subject amplifier 34 to series modulation, and outputs of both amplifiers are synthesized to output an amplitude modulation signal. Since modulation can be performed correspondingly to modulation signal components in spite of a single power source, loss can be reduced.

Inventors

• 👤 Tetsuo Yoshida

Bibliographic Details