[sdiy] expo accuracy? or integrator accuracy?, or both?

[René Schmitz]

Hi Ian, Hi Martin!

>Of course, in the end you have to look at the whole picture and also work 
>especially hard at the "weakest links".

Sure you have to identify the areas where you can the largest improvements.
But for that, you will have to do it for _all_ of them. That was the whole
point.

>But you have to understand all the problem areas and what the limits are in 
>each area before you can do that.

Exactly. Perhaps a good thing to see what the effects of open-loop gain,
amplifier input bias and open-loop output impedance are, is to make an
oscillator with a relatively poor integrator. One that satisfies these
criterions is the CMOS inverter for example. By choosing that, one actually
can make real measurements and actually see the effects of these parameters.
(Since a simulation will get you an answer, but not necessarily a valid one.)

>I thought Martin did a nice job of laying all this out.

Of course! And I should say that I never took some of these points into 
consideration. The temperature effects of open loop gain for example.

My comments were merely aimed to also include the rest of the circuit into 
the consideration. The question here is what effects exist in CCOs (and not 
just integrators) and whether they affect the overall circuit performance. 

Cheers,
 René


-- 
uzs159 at uni-bonn.de
http://www.uni-bonn.de/~uzs159