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

Jul 04, 2005 5 Replies
J

See attachment at...



Newsgroups: alt.binaries.schematics.electronic Subject: Power MOS, Log(ID) versus Gate-Source Voltage - LogIDvsVGS.pdf Message-ID:



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 Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
Vote
Twitter Facebook LinkedIn
W

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. :>)

Thanks, - Win
Vote
Twitter Facebook LinkedIn
J

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 Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | |

formatting link
| 1962 | I love to cook with wine. Sometimes I even put it in the food.

Vote
Twitter Facebook LinkedIn
W

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

Thanks, - Win
Vote
Twitter Facebook LinkedIn
J

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 Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | |

formatting link
| 1962 | I love to cook with wine. Sometimes I even put it in the food.

Vote
Twitter Facebook LinkedIn
W

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

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
Vote
Twitter Facebook LinkedIn

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required