Patent ID: 6922066
Filing Date: 2005-07-26
Classification: G01R,G11C

Abstract:
1. A sampler for use in measuring a waveform of an electric signal given as a measurement target signal, comprising: branch means for branching the measurement target signal into first and second currents; generating means for generating a single flux quantum (SFQ) pulse in response to the first current; pre-frequency dividing means for frequency-dividing the SFQ pulse into a frequency-divided pulse; delay means for delaying the frequency-divided pulse by a controllable delay time to produce a frequency-divided and delayed pulse as a trigger current; comparing means, responsive to the trigger current, the second current, and a feedback current, for conducting a switching operation in accordance with values of the second and the feedback currents each time when the trigger current is given, to produce an output pulse; and voltage converting means for converting the output pulse produced by the comparing means into a converted voltage; the waveform of the electric signal being measured on the basis of the converted voltage.