Patent Number: 6,369,655

Title: Feedback circuit and amplifier and mixer comprising the same

Abstract: A feedback circuit is connected between a drain electrode and a gate electrode of an FET. The feedback circuit is constituted by a series connection of a feedback amount adjusting resistor and an LC series resonance circuit. The LC series resonance circuit is constituted by a series connection of a capacitor and an inductor. The capacitance of the capacitor and the inductance of the inductor are set such that the LC series resonance circuit enters a short-circuited state with respect to an m-th harmonic by resonating at the frequency of the m-th harmonic, and the LC series resonance circuit enters an opened state with respect to a fundamental wave.

Inventors: Nishida; Masao (Sakai, JP), Sawai; Tetsuro (Oogaki, JP)

Assignee: Sanyo Electric Co., Ltd.

International Classification: H03H 11/04 (20060101); H03H 11/12 (20060101); H03F 001/34 ()

Expiration Date: 04/09/2019