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mohdfaaf



Joined: 26 Sep 2004
Posts: 23
Location: malaysia
Post08 Oct 2004 5:47   question:
What is bandgap diode? What is the difference between a bandgap diode compared to others.

Thanks.
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khafaji



Joined: 28 Sep 2004
Posts: 19
Helped: 1
Post08 Oct 2004 11:32   question:
are you mean tunnel diode?
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mohdfaaf



Joined: 26 Sep 2004
Posts: 23
Location: malaysia
Post08 Oct 2004 16:32   Re: question:
I am not sure whether bandgap diode is the same like tunnel/esaki diode.
I believe the bandgap diode is used for providing reliabe reference voltage. The thing is I dont know why is it called as bandgap diode. Based on the diagram it looks like the normal PN junction.

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mohdfaaf



Joined: 26 Sep 2004
Posts: 23
Location: malaysia
Post08 Oct 2004 16:33   Re: question:
Forgot 1 more thing, if based on the IV curve its not tunnel diode.
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davorin



Joined: 07 Jun 2003
Posts: 1490
Helped: 8
Post08 Oct 2004 16:38   Re: question:
1. Do not add a new post 1 minute later. Edit last post instead or you might get warning in the future!!

2. Use a real subject for your requestion..not just "question:" !!!!
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mohdfaaf



Joined: 26 Sep 2004
Posts: 23
Location: malaysia
Post08 Oct 2004 19:12   Re: question:
Thanks for the reminder.
Will follow the rules.

To all, finally I have the understanding for bandgap diode. Basically bandgap diode is the PN diode which uses the bandgap for its mechanism. It is used for bandgap reference circuit. The most used circuitry is with resistor with negative TCR and the bandgap dioses used as many as to get the net TCR = 0 ( or minimal as possible ). TCR - is the temp coefficient. Diode has positive TCR and resistor has negative TCR. I am referring to CMOS .

A good bandgap diode must have ideality factor close to 1.

rgds
azlan faizal
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