INTEGRATED AMPLIFIER CIRCUIT

摘要

PURPOSE:To attain the application of the titled circuit to the component of a class F amplifier by making an output matching circuit in an integrated circuit package match with both the fundamental frequency and its 2nd order harmonic component. CONSTITUTION:The output matching circuit 12 is provided with a fundamental wave matching stub circuit 31 and a 2nd order harmonic matching stub circuit 32. Moreover, the fundamental wave matching stub circuit 31 and the 2nd order harmonic matching stub circuit 32 are placed on a strip circuit with a proper distance. In designing the length properly, the output impedance of an FET chip 22 is to be matched at two frequency points of the fundamental wave and its 2nd order harmonic component. The level of the fundamental wave component and the 2nd order harmonic component in the output signal of the FET chip 22 is not lowered, and the signal is fed to an output terminal 17 of an IC package 21.