[sdiy] TI OTA

[Tom Arnold]

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:
----start----
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.
----end----

-- 
 -----------------------------------------------------------------
 - Tom Arnold       -  Free Synth DIY webspace http://www.sdiy.org 
 - SynthGeek        -  "...is it a virus, a drug, or a religion?"
 - K6AET            -  Juanita Shrugs. "What's the difference? 
 --------------------         -- Neal Stephenson,  Snow Crash