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Old 25th May 2005, 02:49 AM   #1
sovadk is offline sovadk  Denmark
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Default Discrete triangle generator

Hi

I've made a simple discrete triangle generator if any of you are interested.

With the current values it's osscilating at 1kHz. Decresing C2 will increese the frequency.

The schematic:
Click the image to open in full size.

A simulaion:
Click the image to open in full size.


I've attached the Orcad 10.3 project files.
Enjoy


Best regards
Kaspar Sinding Meyer
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File Type: zip triangle.zip (56.8 KB, 193 views)
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Old 25th May 2005, 07:30 AM   #2
Pierre is offline Pierre  France
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Interesting...
Have you tried to put it to oscillate at about 250-400KHz? How does the triangle look like?

Best regards,
Pierre
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Old 25th May 2005, 12:46 PM   #3
sovadk is offline sovadk  Denmark
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Good question. I have tryed that, The triangle wave gets a little bit idstorted in the bottom @ 400kHz, but else it looks fine. However I think that can be solved.
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Old 25th May 2005, 01:37 PM   #4
sovadk is offline sovadk  Denmark
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Okey heres what you'll have to do to make it work @ 500kHz . Change R7 to 1.5k, R2 to 2.2k and C2 to 330p. To improve linearity decreese C7 to 47p.

This is my simulation results:

Click the image to open in full size.

One way to evaluate the linearity of the triangle wave is to look at it's derivative. One should expect a pure square wave. This is my results:

Click the image to open in full size.
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Old 25th May 2005, 03:55 PM   #5
Pierre is offline Pierre  France
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I must admit that's very good.
Have you used it in a Class-D amplifier?
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Old 25th May 2005, 04:01 PM   #6
sovadk is offline sovadk  Denmark
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No I haven't yet used it, since I designed it yesterday.
Right now I'm using a solution with one comperator and a couple of BJTs. I've posted the design here:
triangle wave
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