Engineering topics

Wiseman, Don R.

Publications and source records attributed to Wiseman, Don R..

2 records

NASA NTRS1993

Proton radiation testing of an 18 bit A/D converter

An 18-bit first order incremental analog to digital converter (ADC) has been constructed in a 2 mu commercial CMOS process. The ADC was exposed to energetic protons at the Harvard Cyclotron Laboratory to simulate latch-up and noise behavior in low earth orbits. Results of the test indicate no latch-up problems and only a small loss in accuracy while operating in proton radiation with energies similar to the South Atlantic Anomaly.

Thelen, Donald C.↗

NASA NTRS1992

A high speed CMOS A/D converter

This paper presents a high speed analog-to-digital (A/D) converter. The converter is a 7 bit flash converter with one half LSB accuracy. Typical parts will function at approximately 200 MHz. The converter uses a novel comparator circuit that is shown to out perform more traditional comparators, and thus increases the speed of the converter. The comparator is a clocked, precharged circuit that offers very fast operation with a minimal offset voltage (2 mv). The converter was designed using a standard 1 micron digital CMOS process and is 2,244 microns by 3,972 microns.

Wiseman, Don R.↗