Patent ID: 8358202
Filing Date: 2013-01-22
Classification: H04B

Abstract:
1. A semiconductor device comprising an antenna and a chip, the chip comprising: a rectifier circuit portion comprising a first capacitor and a first diode; a protection control circuit portion comprising a first transistor, a second transistor, and a second diode; a bias circuit portion; and a protection/modulation circuit portion comprising a third transistor, wherein a first terminal of the first capacitor is electrically connected to a first terminal of the antenna, wherein a second terminal of the first capacitor is electrically connected to a first terminal of the first diode, wherein a second terminal of the first diode is electrically connected to a first terminal of the first transistor, wherein a second terminal of the first transistor is electrically connected to a first terminal of the second transistor, a first input terminal of the bias circuit portion, and an output terminal of the bias circuit portion, wherein a gate of the first transistor is electrically connected to a first terminal of the second diode, wherein a second terminal of the second transistor is electrically connected to a second terminal of the antenna, wherein a gate of the second transistor is electrically connected to a third input terminal of the bias circuit portion, wherein a second terminal of the second diode is electrically connected to the second terminal of the antenna, wherein a second input terminal of the bias circuit portion is electrically connected to the second terminal of the antenna, wherein a first terminal of the third transistor is electrically connected to the first terminal of the antenna, wherein a second terminal of the third transistor is electrically connected to the second terminal of the antenna, and wherein a gate of the third transistor is electrically connected to the output terminal of the bias circuit portion.