[sdiy] Digital VCO

[Eric Brombaugh]

Don't give up yet! Those are all fairly simple to implement from a 
system standpoint, and with the proper processor they could be easily 
implemented. The main problem is that they're hard to do well on an 
8-bit 2 MIPS processor with funky I/O.

With a decent 32-bit processor and a sufficiently high clock rate, all 
your DVCO dreams could be realized. It's just going to take more than a 
$4 8-pin PSoC to do it.

I've got an Analog Devices ADuC7020 waiting in the wings for my next 
project. That has a 45MHz ARM7, a 12-bit 1MHz ADC and 4 12-bit DACs on 
it. Realtime embedded DSP is well within it's capabilities and believe 
me that I've got some ideas on some cool stuff to do with it. This PSoC 
project is just the training-wheel phase...

Eric


David Cornutt wrote:
> I've fantasized for a while about building a DVCO.  Things I'd like to 
> put in:
> * non-linear, non-log voltage/freq cal curves
> * voltage-controlled phase
> * sync to arbitrary phase
> * various forms of voltage-controlled wave shaping
> I'm seeing, from this discussion, that my idea would take a lot of 
> horsepower.
>
>