Boots – shoes – and leggings
Patent
1976-07-12
1978-01-24
Wise, Edward J.
Boots, shoes, and leggings
364515, 250445T, 340347CC, H03K 1302, G01N 2300
Patent
active
040707075
ABSTRACT:
A data acquisition system, for use in computerized x-ray tomography equipment, comprises hundred data transmission channels, each of which includes a ramp comparison type (i.e., a single slope) A/D converter. The comparator elements in the converters may exhibit substantial propagation delays which contribute to offsets in the values of data transmitted through the channels.
The effect of comparator propagation delays may be reduced by preconditioning each converter before each digitization: a small signal voltage is injected into each converter. The injected voltage is then removed by a linear integration which is terminated in response to an output signal from the comparator element. A negative residue voltage remains on each converter circuit which, during a subsequent digitization, functions to cancel the offsets produced by propagation delays in that circuit.
REFERENCES:
patent: 3541320 (1970-11-01), Beall
patent: 3667055 (1972-05-01), Uchida
patent: 3879668 (1975-04-01), Edwards
patent: 3893103 (1975-07-01), Prill
patent: 3940625 (1976-02-01), Hounsfield
patent: 3973128 (1976-08-01), LeMay
patent: 3996467 (1976-12-01), Froggatt et al.
patent: 4002911 (1977-01-01), Hounsfield
patent: 4008400 (1977-02-01), Brunnett et al.
Cohen Joseph T.
Cutter Lawrence D.
General Electric Company
Squillaro Jerome C.
Wise Edward J.
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