Re: Dos and don'ts

On Sun, 30 Dec 2007 10:58:48 -0800, John Larkin
<jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

On Sun, 30 Dec 2007 09:17:59 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon@xxxxxxxxxxxxxxx> wrote:

On Sat, 29 Dec 2007 17:24:32 -0800 (PST), Winfield
<winfieldhill@xxxxxxxxx> wrote:

[snip]

John used 50k and an LT1124 opamp in his post,
ftp://66.117.156.8/Clipper.jpg
I tried 20k and an OP27. I don't know what NPN
and PNPs John used; in an effort to keep the die
size (capacitance) down, I used 2n3904 and 2n3906.

Anyone have a subcircuit for an LT1124 ??

I would want to run in PSpice so I can use my "world-renowned" loop
gain and phase checker ;-)

...Jim Thompson

I just picked the LT1124 because I use them sometimes and the model
was there in LT Spice, so I knew about what it behaves like. In real
life, I plan to use an LF353, which is a lot slower. BCX70 and 71 for
the transistors. Should be bog stable. I wouldn't normally bother to
simulate something this simple.

John


For some reason I couldn't find the LT1124 in my copy of LTspice, but
I found it on Linear's website.

One needs to express caution, bog slow doesn't necessarily equate with
bog stable.

My biggest scare was recent. An amplifier that PSpice said has
serious ringing/near oscillation and my LoopGain tool couldn't cope
with the multiple feed back loops (Auggie Ochoa and I presently
working a solution), came out of chip processing working just ducky.

In case you haven't noticed, I tend toward overly cautious ;-)

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

America: Land of the Free, Because of the Brave
.

Loading