Re: [avr-gcc-list] ATmega16 PWM

[Per-Tore Aasestrand]

Hi,

The theoretical determination of the frequency spectrum of a PWM signal
is considered to be difficult. 

Here is a reference I found interesting:

http://www.buet.ac.bd/eee/icece2002/paper_083.pdf

Per-Tore

At 00:50 27.07.2007, Thomas D. Dean wrote:
> I discovered the spectrum of the
> PWM wave was strange.
>
> I used the Fast PWM mode, 31kHz and a sinewave 600Hz modulation
> frequency, sampled 8 to 32 times per cycle.  IOW, I changed the
> PWM
> pulse width 8 to 32 times per cycle of the modulation sine wave. 
> The
> modulation sine wave sampling rate seemed to make little difference
> in
> the FFT of the output as displayed on a TDS 2014.
>
> I can post the code and FFT, if anyone is interested.
>
> tomdean
>
>
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