4046 VCO experiment

[Magnus Danielson]

From: Martin Czech <czech at Micronas.Com>
Subject: Re: 4046 VCO experiment
Date: Thu, 17 Aug 2000 09:38:03 +0200 (MET DST)

Hi Martin,

> The current source should be pretty linear but with some error at the
> low end. (Why not use a jfet precision current source?).
> 
> I think the inner VCO circuitry is not published.

It is... if you *really* want I could scan it for you...

> Linearity is not neccessary for most of the applications.  Who will
> demodulate FM with that chip anyway?

Well, it is not your average FM radio station demodulator, but it can be used
for many OTHER FM demod applications.

> It seems to be fabricated in the very same CMOS process
> then anything else of this logic family.  So there are limitations on
> matching, mirrors etc. Certainly the internal integrator has low gain
> (but high bandwidth).
> 
> Could you be more specific on the error?

Cheers,
Magnus