Patent ID: 7995977
Filing Date: 2011-08-09
Classification: G01R,H03G

Abstract:
1. A high frequency power detector circuit for detecting a power level of an input high frequency signal comprising: first and second envelope detector circuits each having a resistance row, a capacitative element connected to the resistance row in parallel and a transistor connected between a connection point between the resistance row and the capacitative element and a predetermined voltage node; a level shifter for shifting a center level of the high frequency signal to a predetermined voltage; and a detector for detecting an intermediate terminal voltage of the resistance row of the first envelope detector circuit with reference to a total voltage or an intermediate terminal voltage of the resistance row of the second envelope detector circuit; wherein an output of the level shifter is supplied to a gate or a base of the transistor of the first envelope detector circuit and the predetermined voltage is supplied to a gate or a base of the transistor of the second envelope detector circuit.