On Mon, 5 Dec 2005 17:14:15 GMT, Andy Cowley
wrote:

RST Engineering (jw) wrote:

Agreed, John, 150 MHz is damned near DC for a lot of us, but as yet I have
no answer from the "spice" folks for the 1 nf capacitor question. A lot of
fancydancing but no answers.



Try them on a toroidal inductor, even at HF. I have good reason to
believe they won't have anything like a model to predict self
capacitance/resonance.

vy 73

Andy, M1EBV

Model making is driven by need. 1nF capacitors don't exist on-chip
(at least not very often , so I don't have a model. But I have
built a model of a wirebond that is good up into the 3GHz range.

...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.