| 摘要 |
PURPOSE:To execute a signal current level detection with high revolving power and high-speed by combining a Josephson sampling gate, a current generating means with a wide dynamic range and a minute current generating means. CONSTITUTION:A high-speed sampling pulse Ip and a signal Iu to be observed are inputted in the mutually cancelling direction to a Josephson sampling gate 6, and a direct current Ics for detecting crest value is given in the same direction of the sampling pulse Ip. The signal current value to be observed is converted into a signal current level of a direct current for detecting crest value and outputted. Operations of the 1st and 2nd current generating means 11 and 12 are controlled by a sequential signal outputted from a sequence control circuit 15, and these means 11 and 12 have such a current generating function that an output current is increased or decreased according to presence or absence of an output voltage Vs of the sampling gate every sampling frequency Ts. Thus, a direct current supplying system for detecting crest value with high speed and high revolving power is formed, which can achieves acceleration and high resolution of the Josephson sampling system.
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