SEMICONDUCTOR INTEGRATED DEVICE

摘要

PURPOSE:To amplify a low level electric signal without mixture of noise by utilizing a light signal for the supply of electric power and transmission of an output signal. CONSTITUTION:An amplifier circuit 4, a light receiver 5 and a light controller 6 are formed on the surface of a semiconductor substrate 3 in a semiconductor integrated circuit 2. An electric energy converted in the light receiver 5 is supplied to the amplifier circuit 4 to operate the respective circuits forming the amplifier circuit 4. The light controller 6 is, for example, a light controlled element such as a light emitting diode or a liquid crystal to control the intensity of the light or the light transmission coefficiency in response to the output signal from the amplifier circuit 4. One end of an output optical fiber 8 is connected to the light controller 6.