Voltage standard apparatus

摘要

A programmable voltage standard element which consists of Josephson junction arrays having Josephson junction devices which are connected in series generates constant voltage by impression of bias current and microwave. <??>The voltage standard element has bias current terminals each of which is provided for a respective section comprising a Josephson junction devices of in-series connection that are divided by the number of the nth power of 3. A bias current supply circuit independently impresses bias current of a predetermined value to a bias current terminal for every section. A controlling circuit controls a bias current supply circuit to impress bias current of a predetermined value to a Josephson junction array of each section and control impression of microwave. <IMAGE>