Interpolating time-measurement apparatus

Details Interpolating time-measurement apparatus Interpolating time-measurement apparatus

1987-04-22

1988-08-16

Heyman, John S.

Electrical transmission or interconnection systems

With nonswitching means responsive to external nonelectrical...

Temperature responsive

307246, 307480, 307603, 3281291, 377 20, 364569, H03K 526, H03K 1728

Patent

active

047646942

ABSTRACT:
A time-measurment circuit (10) employs time-expansion circuits (13 and 14) to expand the initial and final portions of the duration of an event so as to measure more precisely those segments of time that typically are not integral numbers of clock periods in length. Each time-expansion circuit (13 and 14) employs a single capacitor (34), which it charges at a rapid rate during the initial or final time segment to be measured and then discharges at a much lower rate. The clock periods that occur during the time required for charging and discharging are counted, so the initial and final segments are measured with greatly enhanced resolution. An emitter-coupled-logic integrated circuit (54) performs the charging of the capacitor (34) by drawing current through its V.sub.CC1 l terminal ( 62).

REFERENCES:
patent: Re31551 (1984-04-01), Bjorke
patent: 3467838 (1969-09-01), Glazebrook et al.
patent: 3668529 (1972-06-01), Meyer
patent: 3970828 (1976-07-01), Klein
patent: 4303983 (1981-12-01), Chaborski
patent: 4584494 (1986-04-01), Arakawa et al.
patent: 4620788 (1986-11-01), Giger
patent: 4685075 (1987-08-01), Murita
patent: 4687998 (1987-08-01), Takatori

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