Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1984-02-13
1986-09-09
Miller, Stanley D.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307200B, 307246, 307353, 307494, 307577, 307579, 328147, H03K 524, H03K 1716
Patent
active
046111301
ABSTRACT:
The present invention relates to a floating input comparator capable of mitigating the effects of parasitic capacitance present at the input stage of the comparator. In particular, the present invention functions to substantially reduce the effects of parasitic capacitive voltage division present at the nodes interrogated during each detection cycle. In accordance with the present invention, precharging devices (40, 42, 44) are coupled between a predetermined reference potential (VDD) and the affected nodes (D, E, C) to precharge the nodes to the full reference potential prior to each detection cycle, thereby eliminating the effects of a changing, unknown parasitic capacitance at these nodes by replacing an unknown parasitic potential with the known reference potential.
REFERENCES:
patent: 4124806 (1978-11-01), Rusznyak
patent: 4211939 (1980-07-01), Furman
patent: 4214175 (1980-07-01), Chan
patent: 4274013 (1981-06-01), Clemons et al.
patent: 4412143 (1983-10-01), Patella et al.
patent: 4521703 (1985-06-01), Dingwall
AT&T Bell Laboratories
Hudspeth D. R.
Koba Wendy W.
Miller Stanley D.
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