Patent ID: 8050651
Filing Date: 2011-11-01
Classification: H03F

Abstract:
1. A detector comprising: a first input terminal; a second input terminal; a first transistor; a second transistor; and a load element, wherein the first and second input terminals can be supplied with complementary input signals reverse to each other in phase, the first and second transistors each include first and second input electrodes and an output electrode, and the first and second transistors emit output currents from the output electrodes in response to supply of an input voltage having a predetermined polarity and a predetermined voltage level to the first and second input electrodes, the first input terminal is connected to the first input electrode of the first transistor and the second input electrode of the second transistor, and the second input terminal is connected to the second input electrode of the first transistor and the first input electrode of the second transistor, the load element is connected between the output electrodes of the first and second transistors and an operating voltage point, the first transistor is larger in degree of conduction than the second transistor in a first cycle where a voltage of the second input terminal shows one of positive and negative polarities with respect to a voltage of the first input terminal, the second transistor is larger in degree of conduction than the first transistor in a second cycle where the voltage of the second input terminal shows the other polarity with respect to the voltage of the first input terminal, and a detection voltage resulting from full-wave rectification arises from a circuit node to which the output electrodes of the first and second transistors and the load element are connected.