The plural current sources which include the transistor (IS1 - IS2, IS3-1 - IS3-63) it possesses, the aforementioned plural current sources (IS1 - IS2, IS3-1 - IS3-63) from each current source (IS1 - IS2, IS3 1 - IS3 63) in the back gate terminal of the transistor which is formed, it impresses forward body bias voltage in the D/A converter which converts the aforementioned digital signal to the analog signal by selecting according to the digital signal which can give the route of the electric current which is output.
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