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Ramp Driven Differential Sense Amplifier

IP.com Disclosure Number: IPCOM000050184D
Original Publication Date: 1982-Sep-01
Included in the Prior Art Database: 2005-Feb-10

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Wolf, PH [+details]


A sense amplifier employing Josephson junctions is proposed that is capable of detecting the presence of very small currents in the order of a few microamperes. The circuit comprises a sense junction and a dummy junction operated in a differential mode. The input current to be sensed as well as a ramp signal are applied to both junctions. The use of the latter signal prevents noise disturbances and causes the junctions to switch to the voltage state. Depending on whether an input current is present, either the sense or the dummy junction switches first.