Christopher L. Fletcher - Santa Barbara CA, US Martins Skele - Langley WA, US
Assignee:
Raytheon Company - Waltham MA
International Classification:
H03M003/00
US Classification:
341143
Abstract:
A low power delta-sigma analog to digital converter for converting current mode signals without an amplifier includes an integration capacitor a comparator and a first switch in parallel with one another and coupled to an integration node A FET and the first switch are disposed in series between a dump capacitor and the integration node. A second switch operates to discharge the dump capacitor, and an output of the comparator controls both switches in opposition. Preferably, no op-amps are included in the circuit, and current is supplied by an imaging component In a first comparator state, the first capacitor charges, the first switch is open and the second switch is closed, and the dump capacitor discharges. In a comparator second state, the first switch is closed and the second switch is open, and the integration capacitor transfers a fixed amount of charge into the dump capacitor through an injection FET operating in saturation.
Dual Comparator Trigger Circuit For Glitch Capture
Jonathan J. Parle - Seattle WA Martins Skele - Langley WA
Assignee:
Fluke Corporation - Everett WA
International Classification:
H03K 5153 H03K 1200
US Classification:
327 74
Abstract:
A glitch trigger circuit for measuring glitches that appear on power line signals includes two comparators and two independently controllable voltage trigger levels to allow proper trigger on glitches of unknown polarity. A high pass filter rejects the power line signal while passing the glitch signals to provide triggering on glitches with voltage amplitudes less than the voltage amplitude of the power line signal.
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