There are a few out there, typically listed as "programmable capacitor
array" or "digital capacitor", etc.

Check NCD2100 http://www.ixysic.com/Products/ProgCap.htm or RFMD rfha3942

Best Regards,
----
Ariel Rocholl
http://www.rf-explorer.com

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
Van Horn, David
Sent: Thursday, October 20, 2016 22:47
To: Microcontroller discussion list - Public. <piclist@mit.edu>
Subject: RE: [EE] Building a Direct Conversion AM Radio Receiver?



>>I recall a chip that has binary weighted capacitors on the chip and an SP=
I
interface.

Harald: Any chance you can fire those neurons?  This is one I've not seen.


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