Accession Number : ADA212527

Title :   The Analysis of Current-Mirror MOSFETs for Use in Radiation Environments.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s) : Martinez, Marino J

PDF Url : ADA212527

Report Date : Jan 1988

Pagination or Media Count : 78

Abstract : Experiments were conducted on current-mirror MOSFETs to examine their suitability for use in radiation environments. These devices, which allow low loss load current sensing (defined by a current-ratio n'), are an important element of many power integrated circuits (PICs). Total-dose testing demonstrated that the current ratio was virtually unaffected for many operating conditions. In all cases, changes were largest when sense resistance was largest and minimal when sense voltage was approximately equal to the load source's voltage. In addition, testing verified the feasibility of using sense-cell MOSFETs for applications which require radiation exposure. A constant-current op-amp circuit showed minimal current shifts, using proper circuit design, following total-dose exposure. Dose-rate testing showed the feasibility of using sense voltage to trigger gamma-dot protection through drain-source voltage clamping, providing a relatively inexpensive alternative to voltage derating. (rh)

Descriptors :   *DOSE RATE, *ENVIRONMENTS, *INTEGRATED CIRCUITS, *RADIATION, CIRCUITS, EXPOSURE(GENERAL), POWER, RATIOS, SHIFTING, SOURCES, TEST AND EVALUATION, VOLTAGE, CIRCUITS, DOSE RATE, ENVIRONMENTS, EXPOSURE(GENERAL), INTEGRATED CIRCUITS, POWER, RADIATION, RATIOS, SHIFTING, SOURCES, TEST AND EVALUATION, VOLTAGE

Subject Categories : Electrical and Electronic Equipment
      Radioactiv, Radioactive Wastes & Fission Prod

Distribution Statement : APPROVED FOR PUBLIC RELEASE