TRANSMITTER EFFICIENTLY TRANSMITTING COMMUNICATION TRAFFIC THROUGH PHASE-MODULATED CARRIER SIGNAL

摘要

PURPOSE: To save the power and to reduce the cost of a transmitter by using a class 'C' amplifier and correcting a generated nonlinear phase characteristic. CONSTITUTION: A PROM 13 generates a data value for execution of prescribed phase shift to offset the phase shift of a class 'C' amplifier 19 and a required extent of phase shift indicating the phase state of input data. Therefore, the class 'C' amplifier 19 can be used to effectively amplify and transmit a phase- modulated carrier signal which has a required modulated envelope function. Amplitude modulation in the class 'C' amplifier 19 doesn't cause any phase distortion, as the result, in an input carrier signal which carries telephone traffic as a phase modulation component. Consequently, an improved transmission equipment having a high power efficiency and a practically low production cost is provided.