Circuits for Josephson Voltage Standards
Research:
1-V SINIS series arrays
For binary-divided series arrays we use SINIS junctions consisting of a multilayer of Superconductor / Insulator / Normal metal / Insulator / Superconductor. We fabricate these arrays in the clean room center of PTB using thin film technology. The current-voltage-characteristic of a 1-V series array clearly shows wide constant-voltage steps under microwave irradiation of a frequency of 70 GHz. (cf. 10-V SINIS arrays).
Picture of a 1-V series array consisting of 8192 SINIS junctions divided into a binary sequence.
