PC-based measurements of the frequency response of operational amplifiers

Date

4-2002

Degree

Bachelor of Science in Applied Physics

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Emmanuel A Florido

Abstract

A PC-based system for measuring the frequency response of various operational amplifiers was implemented. An open-loop circuit for 8-pin op-amps was interfaced to personal computer through an analog-to-digital converter card. The ADC card was calibrated with respect to the multimeter used in a standard testing. The card reading was found out to be linearly correlated with the multimeter reading. A software coded in Turbo C++ was used for automated data acquisition, storage and plotting. The open-loop bandwidth of LM318, LM310, LM301, LM741 and OP27 operational amplifiers was observed using the gathered data from the op-amp open-loop interface circuit and was compared to the manufacturer's data sheet values. The observed bandwidth for LM741 op-amp (0.45 MHz) was within the manufacturer's data sheet value (0.437 - 1.5 MHz). On the other hand, the computed bandwidth for LM301 op-amp (0.75 MHz) was 0.05 MHz lesser than the manufacturer specified value. This can be attributed to the discrepancy of the test conditions between the study and the manufacturer. Meanwhile, the computed bandwidth of LM318, LM310 and OP27 op-amps was limited to 5 MHz only. This due to the maximum output of the function generator used. *Based on the results, operational amplifiers have a fall in response at low and high frequencies. Fluctuation of values in the output voltage of the sample op-amps was also observed at frequencies smaller than 20 Hz. LM318, LM310 and OP27 op-amps have wider bandwidth compared to LM741 and LM301.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

This document is currently not available here.

Share

COinS