Re: current-mode opamps
- From: Tom2000 <abuse@xxxxxxxxxxxx>
- Date: Mon, 25 Feb 2008 15:15:33 -0800
On Mon, 25 Feb 2008 13:53:12 -0800, John Larkin
<jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
On Mon, 25 Feb 2008 09:44:33 -0800, Tom2000 <abuse@xxxxxxxxxxxx>
wrote:
On Sun, 24 Feb 2008 19:07:18 -0800, John Larkin
<jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
At G=2, 100 ohm load, they suggest that both resistors be 715 ohms for
good large-signal performance. Playing with the resistors changes
transient response but doesn't much affect the apparent 10 pF input
capacitance.
The eval board, and the S-params setup, effectively drive the ni input
from a 25 ohm source. The frequency response curves are unclear on
what the generator source impedance may be. They give inverting and ni
curves small-signal, but the large-signal stuff is all inverting. Are
they trying to hide the actual performance?
TI is beginning to disappoint me.
John
John, have you had a chance to compare the TI CFBs with the AD
versions?
(Great thread, by the way...)
Thanks,
Tom
The ADI parts are great if you don't need a lot of voltage swing. We
use AD8009's, 8014's, 8001's, all great parts without quirks.
The TI's have insane slew rates and bandwidth with +-7.5 or even +-15
rails, like nothing else I know of.
TI also makes some insanely fast fixed-gain amps, THS4302 and 4303.
John
Thanks, John. Great info. I'm keeping this whole thread for
reference.
Tom
.
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