1. Precision Waveform Generator ICL8038
Presentation #26
Date:
Author: Adam Shumac

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

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

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

5. What is a waveform generator?
Waveform Output
Control Input
Chip

6. What is a waveform generator?

7. What is a waveform generator?
No Connection - Black

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

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

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

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

12. 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

13. What’s inside a waveform generator?

14. Components involved in triangle wave

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

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

17. 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

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

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

20. How do we use the wf generator?
Typical Application

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

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

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

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

25. Questions

26. Links Data sheet from Intersil:

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

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