Circuit for measuring elapsed time between two events

Details Circuit for measuring elapsed time between two events Circuit for measuring elapsed time between two events

1991-07-17

1992-06-09

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307358, 307234, 328109, 328110, 328111, 328112, 328117, H03K 5153, H03K 522

Patent

active

051210126

ABSTRACT:
A time-to-digital converter for converting a time interval into a digital signal output includes an input section for receiving signals corresponding to the start and stop of the time interval and outputting first and second electrical pulses corresponding in time thereto, a time scaling circuit for receiving the two pulses and producing a voltage pulse whose width is a scaled version of the time interval, an output voltage generator for receiving the voltage pulse and producing a voltage signal corresponding in amplitude to the width of the pulse, a buffer and reset circuit for buffering the voltage signal outputted by the output voltage generator and for resetting the buffering means after the voltage signal is passed through, and an analog to digital converter for converting the voltage signal into a digital signal. The time scaling circuit includes a pair of resistance-capacitance networks having different time constants and initial voltages that are close but not exactly equal and a comparator for receiving signals corresponding to the voltage in each resistance-capacitance network and producing a voltage pulse whose width is proportional to the time interval, the voltage pulse constituting a scaled version of the time interval.

REFERENCES:
patent: 4672238 (1987-06-01), Nemoto

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