Electrical pulse counters – pulse dividers – or shift registers: c – Counting or dividing in incremental steps – Devices having more than two stable states
Patent
1991-10-08
1993-08-17
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Counting or dividing in incremental steps
Devices having more than two stable states
377128, 307322, H03K 2900
Patent
active
052375960
ABSTRACT:
A stepping counter using resonant tunneling diodes (RTDs). The stepping counter utilizes the periodic hysteresis characteristic of a device with folding characteristics such as a RTD connected in series with a resistance. The series circuit is biased in the upper portion of the hysteresis loop through a current source in the case of a step-up counter. When a positive-going pulse is applied through a capacitor across the series RTD-resistor circuit, the operating point jumps to the next highest stable operating point in the hysteresis loop responsive to the leading edge of the pulse, but is prevented from returning to the original operating point at the trailing edge of the pulse because of the hysteresis.
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Heyman John S.
University of Maryland
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