Power MOS, Log(ID) versus Gate-Source Voltage

[Jim Thompson]

See attachment at...

Newsgroups: alt.binaries.schematics.electronic
Subject: Power MOS, Log(ID) versus Gate-Source Voltage -
LogIDvsVGS.pdf
Message-ID: <35fjc1t1n7jooj1slm5k1hb6i0a6srhbq3@4ax.com>

All the discussions here and in A.B.S.E about cobbling up a "patched"
power MOS Spice model to cover low-voltage-low-current characteristics
have always struck me as dangerous, fraught with possibility for error
in other parameters.

The attachment shows how Level=7 seems to naturally cover the region.

So I think two things are in order...

(1) Harass Power MOS manufacturers to provide a correct Spice model

or

(2) Roll you own, but use Level=7 parameters rather than patching.


...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.

 

[Winfield Hill]

Jim Thompson wrote...

See attachment at...

Newsgroups: alt.binaries.schematics.electronic
Subject: Power MOS, Log(ID) versus Gate-Source Voltage -
LogIDvsVGS.pdf
Message-ID: <35fjc1t1n7jooj1slm5k1hb6i0a6srhbq3@4ax.com

All the discussions here and in S.E.D about cobbling up a "patched"
power MOS Spice model to cover low-voltage-low-current characteristics
have always struck me as dangerous, fraught with possibility for error
in other parameters.

The attachment shows how Level=7 seems to naturally cover the region.
So I think two things are in order...
(1) Harass Power MOS manufacturers to provide a correct Spice model
or
(2) Roll you own, but use Level=7 parameters rather than patching.

Meanwhile your curve has the wrong slope and Vth for any typical
MOSFETs I'm aware of. Presumably this can be fixed by tweaking
the model, but you haven't shown us the model, only a putative
plot. Come on Jim, show us the guts, the dirty underbelly. Let
us have a kick or two at the tires. :&gt


--
Thanks,
- Win

 

[Jim Thompson]

Are you ever going to send me numerical data from the 2N7002 so I can
try a Level=7 model fit?

...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.

 

[Winfield Hill]

Jim Thompson wrote...

Are you ever going to send me numerical data from the 2N7002
so I can try a Level=7 model fit?

Sorry, forgot that was on my to-do list.


--
Thanks,
- Win

 

[Jim Thompson]

On 2 Aug 2005 17:58:00 -0700, Winfield Hill
<Winfield_member@newsguy.com> wrote:

Jim Thompson wrote...

Are you ever going to send me numerical data from the 2N7002
so I can try a Level=7 model fit?

Sorry, forgot that was on my to-do list.

I'm anxious to see if Level=7 will do the trick. I'm reluctant to use
behavioral add-ons except for systems.

...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.

 

[Winfield Hill]

Jim Thompson wrote in "Hey, Win, Power MOS, Log(ID) 2N7002"...

Winfield Hill wrote:

Jim Thompson wrote...

Are you ever going to send me numerical data from the 2N7002
so I can try a Level=7 model fit?

Sorry, forgot that was on my to-do list.

I'm anxious to see if Level=7 will do the trick. I'm reluctant
to use behavioral add-ons except for systems.

I'll post my 2n7000 raw-data spreadsheet to a.b.s.e. It has the
display panes set the way I left them the last time I was playing
with some of my data (last April), so you'll have to operate the
Excel controls a bit to see the whole thing. Also, there are more
graphs on the second page.


--
Thanks,
- Win