Patent ID: 6087904
Filing Date: 2000-07-11
Classification: H03C

Abstract:
A modulation circuit, comprising:carrier input means for directly inputting a carrier to a carrier input terminal;a transistor for inputting the carrier inputted by the carrier input means to a control terminal, amplifying the carrier, and outputting the result to a first terminal;modulating wave input means for directly inputting a modulating wave to a modulating wave input terminal and feeding the modulating wave to said first terminal of said transistor while preventing said carrier from being transmitted;self-bias means for setting the bias potential of said transistor;carrier selection means having a parallel resonant circuit for selectively extracting said amplified carrier from said first terminal of said transistor; andmodulated wave output means for extracting the modulated wave from said carrier selectively extracted by the carrier selection means, and outputting the result directly to a modulated wave output terminal.