Patent ID: 9190977
Filing Date: 2015-11-17
Classification: H01L,H03F,H03H,H04B,H04L

Abstract:
1. A semiconductor device comprising: a filter circuit operable to pass a desired signal component of a high-frequency signal inputted and operable to attenuate a harmonic component of an integral multiple of the desired signal, wherein the filter circuit comprises: a first inductor and a second inductor coupled in series to a signal line transmitting the high-frequency signal; a first variable capacitor coupled between a power supply line and a node of the first inductor and the second inductor; and a second variable capacitor coupled between the signal line and the power supply line, wherein the filter circuit further comprises: a first input terminal and a second input terminal operable to receive the high-frequency signal as a differential signal, wherein the first inductor and the second inductor are formed by a first differential inductor and a second differential inductor coupled in series between the first input terminal and the second input terminal, wherein the first variable capacitor is coupled between the power supply line and a node of the first differential inductor and the second differential inductor, and wherein the second variable capacitor is coupled between the first input terminal and the power supply line and between the second input terminal and the power supply line.