How to simulate skin effect in transient analysis?

[Greg]

Hi,
in most spice versions it is not a problem to simulate the skin effect
(maybe of an inductor) for AC analysis as there is often the variable
"freq" and you can assign a series resistor (in series to the
inductor...) the value "skin*squareroot(freq)".
But in transient analysis there is no variable freq. How can one
simulate a frequency dependent resistor there?

Greg

 

[Jim Thompson]

On 16 Jul 2005 05:07:09 -0700, "Greg" <gfoersler@gmx.de> wrote:

Hi,
in most spice versions it is not a problem to simulate the skin effect
(maybe of an inductor) for AC analysis as there is often the variable
"freq" and you can assign a series resistor (in series to the
inductor...) the value "skin*squareroot(freq)".
But in transient analysis there is no variable freq. How can one
simulate a frequency dependent resistor there?

Greg

You have to make up a multi-lump model. I have a simplified wirebond
model good up to a few GHz. I can post it if you are interested.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

 

[Greg]

Jim,

I would be very glad if you could post it.

Greg

 

[Jim Thompson]

On 5 Aug 2005 16:56:54 -0700, "Greg" <gfoersler@gmx.de> wrote:

Jim,

I would be very glad if you could post it.

Greg

See...

Newsgroups: alt.binaries.schematics.electronic
Subject: My Wirebond Model for Spice Simulation - MyWirebond.pdf
Message-ID: <30kif11lc3sf58jjg08dtnak9gl59fdfv0@4ax.com>

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.