| 摘要 |
PROBLEM TO BE SOLVED: To reduce crosstalk between wirings, to change voltage spectral density in short time, and to sharply reduce costs of the whole device.SOLUTION: A pulse multiplier 21 outputs a magnetic flux quantum voltage pulse in which a magnetic flux quantum number by a spectral density control signal to be supplied from the outside, or a level of a voltage axis direction by superposition of the magnetic flux quantum voltage pulse is multiplied within predetermined unit time Twhenever a pulse of, for example, logic '1' in a pseudo random number sequence is input. A pseudo random number sequence generator 22 generates an M-sequence by using superconduction digital circuit technology. For application to precise measurement, an output circuit consisting of a Josephson transmission line 23 and a SQUID array 24 is constituted by using a Josephson circuit which can be completely quantized. The pulse multiplier 21, the pseudo random number generator 22, and the output circuit are connected to one another by short-distance wiring with high shield efficiency and formed in a reference noise voltage source chip 25. |
