Cryocooled 10 V Programmable Josephson Voltage Standard
Alain Rufenacht, Logan A. Howe, Anna E. Fox, Robert E. Schwall, Paul D. Dresselhaus, Charles J. Burroughs, Samuel P. Benz
Implementation of programmable Josephson voltage standard (PJVS) circuits on cryocooler at 4 K is a challenge. The limited cooling power of the cryocoolers has to balance the heat dissipated by the PJVS circuit in order to maintain a stable temperature. Flat-spot measurements of various quantized voltages produced with all of the sub-arrays of the PJVS circuit current biased and operating at a temperature of 4.3 K produced a step width of 1.32 mA. This result was obtained with a cryostat that uses a 3 kW water-cooled compressor that generates about 270 mW of cooling power at the chip for this temperature.
IEEE Transactions on Instrumentation and Measurement