New tri-VCO design

[René Schmitz]

Hi Ian and list!

Congrats to the new VCO! 

To me the question would be not how well the THATs are matched, but merely
if it is possible to make a current mirror with a current gain that is
trimmable.
(My first guess would be to start from a mirror with emitter resitors and
make the resistors trimmable. It would be the question if the mirror
remains linear.) Could allow to use even not tightly matched devices.
Thinking BCV 61/62 here.

Bye,
 René

At 12:02 23.07.00 -0600, Ian Fritz wrote:
>Hi Jim and list --
>
>The THAT120 looks like it should work pretty well. Did you ever try
>measuring the matching?
>
>Does anyone have a handy way to translate transistor matching specs (hfe,
>hfe matching, Vbe matching, whatever) into current-mirror errors? Don't
>remember ever seeing this.
>
>  Ian
>

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