[sdiy] New OTA

[Harry Bissell Jr]

Uhhh.. yeah

(just got their e-mail)

It looks pretty strange to me.  I only get about
half of what they are saying.  I'm used to the OTA
as having a differential voltage input, and having an
output current that is the product to the input
differential voltage and the control current. (ie a
four terminal device).

I only see three terminals here.  They have a state
variable schematic shown, but at first glance it does
not look tunable (as we like to do).

No "vca" example.

What we got here ???   I'm also sorry to say its SMT
only. I think its more of an RF part.

There is an OTA made by Linear Tech as well (imho) but
its a $10 part.  OUCH !!!

H^) harry

--- Ian Fritz <ijfritz at earthlink.net> wrote:

> New from TI:
> 
> ------------------
> Wide-Bandwidth Operational Transconductance
> Amplifier and Buffer: The 
> OPA860 is a wideband (>400-MHz) op amp with
> >1200-MHz closed-loop buffer 
> bandwidth.
>     * Low Quiescent Current: 11.2mA
>     * Applications: State-Variable Filters,
> Free-Running DC Clamp, 
> Broadcast Video Equipment
> ---------------
> 
> Anyone had a chance to look into this?
> 
>