Patent ID: 8326235
Filing Date: 2012-12-04
Classification: H01Q,H04B

Abstract:
1. A communication device comprising: a first node connected to an antenna; a transmission unit outputting a signal to the antenna via the first node; a reception unit having a signal input thereto from the antenna via the first node; a first switch provided between the first node and the transmission unit; and a second switch provided between the first node and the reception unit, wherein the second switch is alternately turned on and off repeatedly, the reception unit comprises an amplifier amplifying a signal that the transmission unit outputs via the first and second switches and a mixer mixing a signal amplified in the amplifier and a local signal, the mixer has a leakage signal of the first switch when the first switch is off input thereto, and wherein the first switch comprises: a plurality of inductors connected in series between the first node and the transmission unit; a first n-channel field-effect transistor having a drain thereof connected to an Interconnection point of the plural first Inductors, having a source thereof connected to a reference potential node, and having a voltage higher than a threshold voltage applied to a gate thereof, and the second switch comprises: a plurality of second inductors connected in series between the first node and the reception unit; and a second n-channel field-effect transistor having a drain thereof connected to an interconnection point of the plural second inductors, having a source thereof connected to a reference potential node, and having a voltage higher than a threshold voltage and a voltage lower than the threshold voltage alternately applied to a gate thereof.