[sdiy] TI OTA

Paul Schreiber synth1 at airmail.net
Fri Dec 14 02:47:52 CET 2012

What's wrong with NE5517?


Paul S.

-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Tom Arnold
Sent: Thursday, December 13, 2012 7:31 PM
To: synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] TI OTA

On Fri, Dec 14, 2012 at 12:32:23AM +0100, Magnus Danielson wrote:
> Hi!
> Anyone got experience with the OPA861 OTA?
> Spice simulation model good?

Some digging in the archives found:
Date: Tue, 26 Jul 2005 16:05:01 +0200
From: Nils Pipenbrinck <np at inverse-entertainment.de>
Subject: Re: [sdiy] New OTA

Ian Fritz wrote:

> Wide-Bandwidth Operational Transconductance Amplifier and Buffer: The
> OPA860 is a wideband (>400-MHz) op amp with >1200-MHz closed-loop 
> buffer bandwidth.
> Anyone had a chance to look into this?

I had a look at the predecessor, and I'm not really excited about it. My
concerns are:

 * unspecified linearity (and juding from the charts in the datasheet I can
guess why they haven't specified it).
 * no differential input.
 * expensive, don't know what the OPA860 will cost, but the OPA660 was
anything but cheap.

OTOH it's a lot faster than the good old CA3080, but if you don't really
need the speed it's imho a waste of money.

 - Tom Arnold       -  Free Synth DIY webspace http://www.sdiy.org 
 - SynthGeek        -  "...is it a virus, a drug, or a religion?"
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