Precision Waveform Generator ICL8038

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Presentation transcript:

Precision Waveform Generator ICL8038 Presentation #26 Date: 11-20-2002 Author: Adam Shumac

In this presentation I will show you: What a waveform generator is How a waveform generator works How to use a waveform generator

What is a waveform generator? Waveform Output Control Input A Big Box

What is a waveform generator? Waveform Output Control Input A Function Generator

What is a waveform generator? Waveform Output Control Input Chip

What is a waveform generator?

What is a waveform generator? No Connection - Black

What is a waveform generator? No Connection - Black Power Supply - Orange

What is a waveform generator? No Connection - Black Power Supply - Orange Input Pins - Teal

What is a waveform generator? No Connection - Black Power Supply - Orange Input Pins - Teal Output Pins - Red

In this presentation I will show you: What a waveform generator is How a waveform generator works How to use a waveform generator

How does a waveform generator work? Generates triangle waveform by charging and discharging a capacitor Creates square waveform and flips switch by comparing triangle waveform to constants Sends triangle waveform through sine wave converter to create sine waveform

What’s inside a waveform generator?

Components involved in triangle wave

Charging Capacitor Capacitor like a bucket Current source Like a water pump

Discharging Capacitor Bucket Analogy Water Pumped in at rate l Water Pumped out at rate 2l

Square wave and switch operation Comparator 1 waits for peak Comparator 2 waits for valley Flip Flop Operates Switch Flip Flop output is Square Wave

Sine wave Triangle Wave sent through non-linear network to create sine wave

In this presentation I will show you: What a waveform generator is How a waveform generator works How to use a waveform generator

How do we use the wf generator? Typical Application

How do we pick component values? Choose Desired Frequency Choose current value within chip constraints Calculate Resistors’ Value Calculate Capacitor Value

How do we pick component values? Constraints: 10uA < (Current through RA and RB) < 5mA 1mA optimum Choose Largest Possible Capacitor Value

In this presentation I will show you: What a waveform generator is How a waveform generator works How to use a waveform generator

Demo Show all three waveforms, symmetrical Vary Frequency Vary Amplitude Show triangle wave asymmetrical Frequency Sweep

Questions

Links Data sheet from Intersil: http://www.intersil.com/data/fn/fn2/fn2864/FN2864.pdf

Example Single 10v Power Supply Desired Frequency = 1kHz Desired Current = 1mA RA = RB

Example R = 0.22*(10v)/1mA = 2.2k ohm C = 0.33/(2.2k * 1k) = 0.15 uF