Sine and square wave function generator

[analog_sa]

A relatively simple way to generate any waveform is by using a microcontroller, a look-up table or algorithm and a DAC. For a 90S8515 + absolute minimum of external components the code is really simple. You can easily get around 0.01% thd. Not to mention a whole new hobby I am sure there are more elegant DSP based solutions as well.


regards

peter

[peranders]

Originally posted by Bricolo


that's exacty what I was looking for

but what is low-distortion? 0.1%, 1%, more?

Don't expect better than 2%, maybe 1%. The sinus wave is triangle wave which is fixed in a unlinear circuit.

[sam9]

Check out the oscillators described in these two aplication notes.


http://www.linear.com/pdf/lt1122.pdf

http://www.linear.com/pdf/lt1115fa.pdf

[jackinnj]

do a google search under "Walsh Series" for the mathematics. Don Lancaster also has an article on this at www.tinaja.com

Originally posted by analog_sa
A relatively simple way to generate any waveform is by using a microcontroller, a look-up table or algorithm and a DAC. For a 90S8515 + absolute minimum of external components the code is really simple. You can easily get around 0.01% thd. Not to mention a whole new hobby I am sure there are more elegant DSP based solutions as well.


regards

peter

[Rob M]

I just built one of these . It's probably okay for some purposes but I wouldn't call it "low distortion".