MODULATOR

PURPOSE:To always output a carrier wave whose phase difference is 90 deg. to a modulating part by adjusting the phase difference of the carrier wave automatically without intermediary of manual operation. CONSTITUTION:A first carrier wave C1 outputted from a carrier oscillator 6 is outputted to a fi...

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Bibliographic Details
Main Author DEGUCHI TAKUMI
Format Patent
LanguageEnglish
Published 18.06.1993
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Summary:PURPOSE:To always output a carrier wave whose phase difference is 90 deg. to a modulating part by adjusting the phase difference of the carrier wave automatically without intermediary of manual operation. CONSTITUTION:A first carrier wave C1 outputted from a carrier oscillator 6 is outputted to a first modulator 3, and simultaneously, it is outputted to a phase shifter 7. In the phase shifter 7, a second carrier wave C2 having the phase difference of 90 deg. from the first carrier wave C1 is generated, and this second carrier wave C2 is outputted to a second modulator 4. On the other hand, a detection control circuit 8 controls the phase shifter 7 so that the phase difference between the first carrier wave C1 and the second carrier wave C2 is always orthogonal, and changes the phase of the second carrier wave C2.
Bibliography:Application Number: JP19910336190