Raytheon Company

Fluke Corporation

Martins Skele

Christopher L Fletcher

Jonathan J Parle

A low power delta-sigma analog to digital converterfor converting current mode signals without an amplifier includes an integration capacitora comparatorand a first switchin parallel with one another and coupled to an integration nodeA FETand the first switch are disposed in series between a dump capacitorand the integration node. A second switchoperates 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 componentIn 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.

Low power current input delta-sigma ADC using injection FET reference

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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Langley, WA, United States of America

Martins Skele