Patent ID: 7557600

Claim:
A programmable Josephson voltage standard device employing microwave driving of multiple frequencies, comprising: a first element group having a plurality of Josephson junctions connected in series and applied with a first frequency; a second element group having a plurality of Josephson junctions connected in series and applied with a second frequency different from the first frequency; and a current bias means for selectively applying positive (+) current or negative (−) current to the Josephson junctions of the element groups or stopping the supply of the current, in response to an input command; wherein the first element group and second element group are connected in series, and wherein the current bias means is configured to apply current in a binary method in which the current is divided in the ratio of 2 n (n=0, 1, 2, . . . ) from the first Josephson junction of each of the element groups.