Patent ID: 7629857
Filing Date: 2009-12-08
Classification: H03B

Abstract:
1. A second harmonic oscillator that has a series positive feedback configuration, suppresses output of a fundamental signal, and outputs a second harmonic signal having a frequency in a range from 1 GHz to 200 GHz which is generated inside a circuit, comprising: a transistor having a base terminal, a first emitter terminal, a second emitter terminal, and a collector terminal; a resonator circuit that is connected to the base terminal; a first transmission line short-circuiting stub that has a first line length and that is connected to one of the first emitter terminal and the second emitter terminal; and a second transmission line short-circuiting stub that is connected to the other of the first emitter terminal and the second emitter terminal and that has a second line length which is different from the first line length of the first transmission line short-circuiting stub.