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Re: [802.3_4PPOE] Diode mismatch values



Thanks a lot.

Yair

 

From: Jeff Heath [mailto:jheath@xxxxxxxxxx]
Sent: Wednesday, July 02, 2014 8:56 PM
To: Darshan, Yair; STDS-802-3-4PPOE@xxxxxxxxxxxxxxxxx
Subject: RE: [802.3_4PPOE] Diode mismatch values

 

I believe it was this for the curves in this slide:

 

Fairchild Semi

S1BFSCT-ND

 

We tested other diodes as well for matching data:

 

Fairchild Semi

S1BFSCT-ND

General Purpose, 100V, 1A, SMA

Micro Commercial

GS1B-LTP

Diode, General Purpose, 100V, 1A, D0214AC

Fairchild Semi

S1BFSCT-ND

General Purpose, 100V, 1A, SMA

Micro Commercial

GS1B-LTP

Diode, General Purpose, 100V, 1A, D0214AC

 

 

 

Regards,

 

Jeff Heath
Design Center Manager

Description: Linear Technology Corporation

 

 

paper:

402 East Carrillo Street, Suite D

 

Santa Barbara, California 93101

voice:

805.965.6400

fax:

805.965.1701

computer:

jheath@xxxxxxxxxx

 

www.linear.com

 

 

From: Darshan, Yair [mailto:YDarshan@xxxxxxxxxxxxx]
Sent: Wednesday, July 02, 2014 7:46 AM
To: STDS-802-3-4PPOE@xxxxxxxxxxxxxxxxx
Subject: Re: [802.3_4PPOE] Diode mismatch values

 

Yair

 

I guess you meat to Annex G1?.

Yes we need this data set as well.

Please ask in next adhoc meeting for time in the agenda to discuss it and insert it to the adhoc database.

It was lab test or datasheet numbers. Do you have the diode datasheets or P/N?

 

Thanks

 

Yair

 

From: Jeff Heath [mailto:jheath@xxxxxxxxxx]
Sent: Wednesday, July 02, 2014 2:00 AM
To: STDS-802-3-4PPOE@xxxxxxxxxxxxxxxxx
Subject: [802.3_4PPOE] Diode mismatch values

 

Yair,

 

The diode mismatch parameters I your presentation show a wide variation of threshold (.39V vs .53V) and a zero difference in resistance (0.25 ohms vs 0.25 ohms). 

 

I have included my previous lab data on just six diodes which shows just the opposite: a threshold that is very close (Varying by only 0.30V) and a resistance that is wide (0.28 ohms vs 0.40 ohms).

 

Given that in the short channel case, the threshold offset is the major contributor to offset currents, I think we should change the values for the diode mismatch.

 

Regards,

 

Jeff Heath
Design Center Manager

Description: Linear Technology Corporation

 

 

paper:

402 East Carrillo Street, Suite D

 

Santa Barbara, California 93101

voice:

805.965.6400

fax:

805.965.1701

computer:

jheath@xxxxxxxxxx

 

www.linear.com