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Session 3226

Monolithic Integrated Circuit Function Generator Lab Procedure

Theodore E. Fahlsing Purdue University

Abstract

This laboratory exercise will use the XR2206 monolithic IC function generator. The approach will place emphasis on the evaluation of specifications from Exar’s data sheets in comparison to laboratory measured data. The exercise will explore the parameters for setting frequency, amplitude, and waveform shape. The use of the function generator to produce amplitude modulation and frequency modulation signals will also be demonstrated. A complete schematic of a circuit suitable for construction will be provided.

Introduction

The objective of the development of the circuit for this laboratory exercise was to exploit the XR2206 wide sweep range of 2000:1 to produce an audio function generator capable of frequencies from 20 Hz to 20kHz with only one range selection. Students are required to use the manufacturer’s data sheet to analyze the requirements to set the frequency, amplitude and waveform shape of the output. Using the generator to drive a speaker provides the opportunity to examine the effect of the 600Ω output impedance on a 4Ω or 8Ω speaker. This can initiate a discussion of how to decrease the output impedance using operational amplifiers and voltage followers. The amplitude and frequency modulation features usually will increase the students’ natural curiosity. The frequency modulation (FM) can produce some very interesting audio effects. Students should be encouraged and motivated to explore changing frequencies using the frequency shift keying (FSK) feature. The amplitude modulation (AM) feature can be demonstrated in an exciting fashion by changing the timing capacitance value to produce an approximate 600kHz signal in the AM broadcast frequency band. The modulation frequency can be heard on a standard AM radio receiver positioned close to the circuit. The positive and negative nine volts for the power supply was chosen for simplicity. The use of two nine volt batteries with the circuit provided for construction will result in a totally functional audio signal generator project. The author would like to encourage you to implement the use of the following laboratory exercise in the education of students.

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Fahlsing, T. E. (2000, June), Monolithic Integrated Circuit Function Generator Laboratory Procedure Paper presented at 2000 Annual Conference, St. Louis, Missouri. 10.18260/1-2--8575