Programmable voltage supply for semiconductor testing and characterization

Date

3-2000

Degree

Bachelor of Science in Applied Physics

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Emmanuel A Florido

Abstract

A microcomputer-based power supply was conceptualized, designed and fabricated. A digital - to - analog (DAC) integrated circuit was used as the programmable voltage supply and an analog - to - digital converter (ADC) as the data acquisition system. The ADC was calibrated to its full scale reading of ±4.096 V. An actual voltage calibration was done and a calibration curve fit of y = 0.922*(voltage input) - 0.294 was obtained. Two modules were fabricated, tested and analyzed. The two modules consist of the address decoder card and the DAC system. The address decoder decodes computer address 310H - 317H. The step size of the system is 0.05mv at 4.096 voltage reference. The DAC has the full scale value of ±4.096 V. Indium antimonide (InSb) and IN4002 semiconductor diode samples were characterized using the system. The forward volt -ampere characteristic of the InSb sample indicates that the material is ohmic and could be used in resistivity and Hall measurement. The forward volt-ampere data for the IN4002 semiconductor diode obtained using the system is consistent with the voltage - ampere characteristic of semiconductor diodes.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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