Abstract: Provided is a transparent transistor including a substrate, source and drain electrodes formed on the substrate, each having a multi-layered structure of a lower transparent layer, a metal layer and an upper transparent layer, a channel formed between the source and drain electrodes, and a gate electrode aligned with the channel. Here, the lower transparent layer or the upper transparent layer is formed of a transparent semiconductor layer, which is the same as the channel. Thus, the use of the multi-layered transparent conductive layer can ensure transparency and conductivity, overcome a problem of contact resistance between the source and drain electrodes and a semiconductor, and improve processibility by patterning the multi-layered transparent conductive layer all at once, while deposition is performed layer by layer.

Abstract: There is provided a feedback amplifier capable of easily controlling its dynamic range without a separate gain control signal generation circuit. The feedback amplifier includes an input terminal detecting an input voltage from input current, a feedback amplification unit amplifying the input voltage to generate an output signal, and an output terminal outputting a signal amplified by the feedback amplification unit. The feedback amplification unit includes a feedback circuit unit including a feedback resistor located between the input terminal and the output terminal, and a feedback transistor connected in parallel to the feedback resistor; and a bias circuit unit supplying a predetermined bias voltage to the feedback transistor of the feedback circuit unit and merged in the feedback amplification unit.