Martins Lyn Skele

US Patent:

6977601, Dec 20, 2005

Filed:

Jan 29, 2004

Appl. No.:

10/769111

Inventors:

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.

US Patent:

54989850, Mar 12, 1996

Filed:

Feb 17, 1994

Appl. No.:

8/199034

Inventors:

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.