Patent ID: 8736249
Filing Date: 2014-05-27
Classification: G01R,H03G

Abstract:
1. A high frequency power detector circuit comprising: a level shifter configured to shift a center level of an input high frequency signal to a predetermined voltage; 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 selector configured to select any one of a plurality of intermediate terminal voltages of the resistance row of the first envelope detector circuit; and a detector configured to detect an output voltage of the selector 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.