freq to v convertor

[Rob]

>I was looking at a f to v ckt, the usual 'convert to a square then
>trigger a uniform narrow pulse then integrate and filter' when
>it occured to me that if you had even just a very basic filter
>(like a RC) and used the pulse to run a sample and hold from
>the RC output, you would be able to get the ripple out completely.
>
>For all I know, this is in fact done already in commercial f to v chips..
>anyone know?
>I need this for a theremin driven f to v.... at the bottom end, NO filter
>is really good enough, if you are going to drive say a VCO from it..
>
Thats kind of hard to say, since I have seen radars that used freq to
voltage conversion to drive analog computers, and they were about 99%
accurate.
Im sure with a little fine tuning, you could get a very stable and accurate
F/V converter.
Although, i realize, too, that at high frequencies, freq-volt converters
become more accurate...

rob