Waveform analyzer using fast fourier transform microcomputer-based implementation

Date

6-1992

Degree

Bachelor of Science in Applied Physics

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Edvino G. Eusebio

Abstract

A Fast Fourier Transform algorithm was written in Turbo Pascal v5.5 to transform analog waveform which is described in the time domain to frequency based representation. The program also includes data gathering and result plotting procedures. The user has a choice for the type of plot to be displayed (i. e. absolute value or decibel). To help process the analog waveform to the microcomputer, an eight-bit analog data acquisition board was interfaced in the microcomputer for the purpose of data gathering. As supplement to the acquisition board, a Voltage Reference Circuit and Input Circuit were designed and constructed on a 3" X 4" printed circuit board. The Reference Voltage Circuit supplies the Analog to Digital Converter of the acquisition board with a stable voltage reference of 4. OV. The Input Offset Circuit raises the input waveform from -2V to +2V peak-to-peak voltage to 0V to 4V peak-to-peak voltage to satisfy the restriction of the Analog-To-Digital Converter minimum allowable input voltage. The choice for the hardware components were meticulously selected to obtain a good performance. For the Reference Voltage Circuit. The LM336-5 Regulator Diode was used coupled with four Si Signal diodes. For the input offset Circuit, the LM308Precision Operational Amplifier was used.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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