Patent ID: 7800436
Filing Date: 2010-09-21
Classification: H03D,H04B

Abstract:
1. A signal extraction circuit for extracting an information signal from a radio frequency signal including the information signal comprising: a shunt regulator for performing a control so as to stabilize a voltage obtained by rectifying the radio frequency signal at a prescribed voltage value; and a signal extraction unit for extracting the information signal from a bypass current sent by the shunt regulator for the control when the voltage fluctuates, wherein the signal extraction unit generates a current corresponding to the value of the current of the bypass current and outputs the generated current as the information signal and the shunt regulator comprises a bypass transistor for controlling the bypass current, wherein the signal extraction unit outputs a current sent by a transistor, of which the same voltage as the gate voltage of the bypass transistor is applied to the gate, as the information signal.