[sdiy] Henry Walmsley's page

[mark verbos]

On Dec 23, 2009, at 2:56 PM, Ian Fritz wrote:

>>
>
> Since the VCO core is just used as a clock, it seems to me that it  
> would make *much* more sense to use a F-V chip (charge balance  
> oscillator) rather than a switched integrator.  I used the LM331 for  
> my DoubleDeka VCO, and it has phenomenal tracking up to well over  
> 100kHz, and rock steady temperature compensation using the Pease  
> scheme.
>
> For the OTA-based VCO it will be difficult to get the core frequency  
> over about 40kHz with decent tracking -- and even that will take  
> quite a bit of effort. That will leave you with a max frequency of  
> ~2.5kHz.


Ian,

What is the actual difference between a VCO and a Voltage to Frequency  
converter? I have heard them mentioned, but it has never made sense to  
me. I need a square wave  oscillator that goes up to around 500kHz for  
a project I'm planning. This may be the solution.

Mark