FET Matching Was: Re: [sdiy] New take on VC moog ladder

[Scott Gravenhorst]

I'm pretty ignorant about matching FETs.  Any clue 
for a schematic for a matcher and the methodology?

Also, what about MOSFETs ?  Same paradigm?  Same matcher?

Don Tillman <don at till.com> wrote:
>   Date: Mon, 31 Dec 2001 06:13:01 -0800
>   From: Scott Bernardi <sbernardi at attbi.com>
>
>   JFET's are much harder to match than bipolar transistors. (that's
>   why the JFET input opamps have looser Vos specs than similar
>   bipolar input opamps). Matching discrete JFET's would be darn near
>   impossible (unless you've got a hundred or so to work from).
>
>Nah, it's easy.  I buy FETs in packs of 50 or 100 and match them by
>hand all the time.  I have a number of audio circuits that wouldn't be
>possible to build if I couldn't match FETs.
>
>   And I'm not aware of any monolithic matched JFET pairs that are
>   available (something like the CA3046 but with JFET's).
>
>They're available, check the Siliconix (Philips, Vishay, whatever it
>is now) catalog.
>
>Matched P Channel JFET pairs are difficult to find.
>
>  -- Don
>
>-- 
>Don Tillman
>Palo Alto, California, USA
>don at till.com
>http://www.till.com
>

=========================================================  
- Government: The other religion.
- The media's credibility should always be questioned.
- Lambs who lie down with lions are lunch.

-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
-- Linux Rex         | RedWebMail by RedStarWare
-- FatMan: home1.GTE.NET/res0658s/TekLab_FatMan_WebSite/index.html