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From: Stan Bischof on 13 Jul 2010 12:22
Jaidev Deshpande <deshpande.jaidev(a)gmail.com> wrote:
> Hey Stan
>
> Thanks. Basically I need to generate a rectangular wave with
> 10% duty cycle and multiply / modulate it with a
> higher frequency sine wave.
>
> Unfortunately the generators I'm using are too crude (and the
> modulator is not programmable either) to give me a reasonably
>accurate rectangular form, and therefore I'm looking
> for digital signal sources.
>

Well, a serial port is NOT in any reasonable sense a
signal generator. Forget the serial port- it is a dead
end for your needs.

You might take a look at a fast USB DIO module like
the Accessio DIO16A hooked to a vanilla DAC.
Sounds like you only need audio
frequencies so with an interface like this you could
do your modulation in software then stream the
resulting waveform digitally ( sample by sample).
You wouldn't get real time of course but close
enough for low frequencies ( you can stream at about
20M samples/sec ). With 16 bit DAC you'd have good
quality analog output. Basic poor mans's AWG.

Stan
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