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kukurigu
Joined: 14 Dec 2002
Posts: 25
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 04 Aug 2004 16:10 What is DMOS transistor? |
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| tags: what is dmos |
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Hello,
What is DMOS transistor? What are its applications, advantages and drawbacks?
Any info is welcome! An article in PDF format would be perfect!
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Hughes
Joined: 10 Jun 2003
Posts: 715
Helped: 85
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| 05 Aug 2004 1:57 What is DMOS transistor? |
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Double-diffusion MOS or Double-implanted MOS.
It is used in high-voltage applications.
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rajesh13
Joined: 07 Jul 2004
Posts: 126
Location: Milky Way
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| 06 Aug 2004 7:17 Re: What is DMOS transistor? |
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| tags: what is dmos |
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| kukurigu wrote: |
Hello,
What is DMOS transistor? What are its applications, advantages and drawbacks?
Any info is welcome! An article in PDF format would be perfect! |
Please find info. in the attached file.
Basically the idea in case of DMOS is to add a series resistor incase of normal cmos transitor so that a higher Vds volatge can be applied.
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goodboy_pl
Joined: 12 Mar 2002
Posts: 243
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| 08 Aug 2004 16:21 Re: What is DMOS transistor? |
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DDMOS: Double Diffusion MOS
the idea behind it is a series connected high voltage jfet to drain pin of a mosfet (it is intrinsic!) to increase Vds breakdown voltage also since current path is vertical, lower Rds(on) and lower gate capacitor is possible in comparison with conventional planar MOSFET. they are used in switching power supplies up to several kilo-watts and RF amplifiers up to 500 MHz with more than 300 watts!
LDMOS: lateral Difusion MOS
their concept is very similar to DDMOS with the ability of integration in ICs and with higher freq. response in comparison with DDMOS.
Their applications are powr amplifiers up to 2GHz and up to 150 Watt, and integrated inteligent IC for switching applications like motor cotroller/drivers, HVIC IGT Drivers, and even fully integrated SMPS!
BEST!
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staric
Joined: 26 Sep 2003
Posts: 79
Helped: 1
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| 09 Aug 2004 15:51 What is DMOS transistor? |
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| tags: what is dmos |
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| What I know the DMOS is used in high-voltage application. And most of them is asymmetry structure. The drain can afford high-voltage. But Vgs in some of them is still low-voltage. Most of them are used in output stage or power device.
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rajesh13
Joined: 07 Jul 2004
Posts: 126
Location: Milky Way
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| 10 Aug 2004 6:21 Re: What is DMOS transistor? |
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| tags: what is dmos |
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| staric wrote: |
| What I know the DMOS is used in high-voltage application. And most of them is asymmetry structure. The drain can afford high-voltage. But Vgs in some of them is still low-voltage. Most of them are used in output stage or power device. |
Yeah most of them are off low Vgs. But since there is no overlap between Gate & drain. so Vgd is not a problem in this case.
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andy2000a
Joined: 18 Jul 2001
Posts: 756
Helped: 7
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| 10 Aug 2004 9:23 Re: What is DMOS transistor? |
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Hi
How to design Smart power IC ?? someone told me Dmos is easy
combine with CMOS process ..
tsmc/umc Hi-V process only 40v and it is low Volt dmos
another friend said DMOS is Hi-V low Power .. like IR Co.
really power IC need "BCD process" but I don't know they use DMOS or Vmos .. in BCD ..
as I know , tsmc /umc or vanguard DMOS still low volt on DMOS ..
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goodboy_pl
Joined: 12 Mar 2002
Posts: 243
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| 10 Aug 2004 22:58 Re: What is DMOS transistor? |
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for HV design u must use HV process not main stream low voltage CMOS procss from tsmc orothers.
some FABs like AMS provide high voltage process with LDMOS (not DMOS!) up to 80 volt suitable for automotive or power managment/driver ICs.
Power integrations uses CMOS/LDMOS for their TOPSwitch and delivers up to 200 watt with an integrated 700 volt power LDMOS!
It is possible to integrate control ckt. in DMOS process also; VIPer from ST use this technique and delivers up to 100 watt!
large companies like IR and ST use their own customized process.
Powerintegration is afabless company but they have developed their own process (CMOS/LDMOS) and OKI japan fabricates for them!
PS:see also
http://www.amazon.com/exec/obidos/aSIN/079238234X/memsclearinghous/102-8972600-6474565
BEST!
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Colbhaidh
Joined: 10 Aug 2004
Posts: 151
Helped: 16
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| 11 Aug 2004 6:48 Re: What is DMOS transistor? |
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LDMOS is offered by TSMC and Chartered SEMI but only for LCD applications so max 40V or +/- 20V. Anything higher than this requires a very large N- drift region for the depletion zone and is not readily integrated with standard CMOS processes. (Become vertical rather than lateral). Higher than 40V will require off-chip.
Motorola and IRF have SmartMOS processes capable of doing this but I do not have any info on them.
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andy2000a
Joined: 18 Jul 2001
Posts: 756
Helped: 7
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| 18 Aug 2004 3:25 Re: What is DMOS transistor? |
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| tags: what is dmos |
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I reading a Book smart power IC tech & app /
B Murari F.Bertotti GA Vignola
/ Springer
this Book talk about BCD process and some Hi-V device in BCD
1. Hi V P_channel Mos
2. LLD (low leakage diode ) -- LL Diode & BC_diode
3. Lateral DMOS
4. vertial DMOS
but I have some question is
what is difference VDMOS/ power U(V)_mos / LIGBT /LDMOS
as I know power Mos is vertial but
no isolation (can not merge with CMOS) , and have large current > 5A
LDMOS = Hi-V low current (current < 5A)
LVMOS = Hi-V Hi-cuurent
L_IGBT = Hi current density > DMOS but have latch problem
UMOS = Hi-V Hi current
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layes
Joined: 27 Sep 2004
Posts: 57
Helped: 2
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| 09 Oct 2004 5:53 Re: What is DMOS transistor? |
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1,high voltage
2,big current
3, low resistor
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Bin_Wang
Joined: 07 Mar 2004
Posts: 16
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| 09 Oct 2004 5:59 What is DMOS transistor? |
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DMOS used in high voltage application and with low
Rdson , you can found it in BCD process provided by Sanyo and SIMBCD.
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mylihua
Joined: 23 Aug 2004
Posts: 20
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| 10 Nov 2004 13:20 Re: What is DMOS transistor? |
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| tags: what is dmos |
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| what is dmos transitor,and ddmos transitor? what is ther layout ?
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cetc1525
Joined: 08 Oct 2004
Posts: 177
Helped: 3
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| 10 Nov 2004 13:44 What is DMOS transistor? |
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| dmos use as a high voltage device .
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electronrancher
Joined: 24 Mar 2002
Posts: 479
Helped: 34
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| 11 Nov 2004 5:58 What is DMOS transistor? |
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| one of the main differences you will see between mos & dmos is that there is only a small portion of diffusion to invert, not whole gate length like in standard SCMOS - most of gate overlaps majority region.
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cloudliu
Joined: 19 Jul 2004
Posts: 27
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| 23 Jul 2006 13:10 What is DMOS transistor? |
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| It's useful for me,thank you!
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ukint
Joined: 15 Jun 2006
Posts: 44
Helped: 3
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| 08 Aug 2006 10:50 Re: What is DMOS transistor? |
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DeMOS stands for drain extended mos.IF u happen to see the layout you can find that there are two drains shorted as one and one source.This helps in draining or taking in huge voltages.For eg.A 1.8v DEMOS can take upto 3.3V.
find the doc attached.Could be useful!!!!!
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tkyoo0220
Joined: 10 Aug 2006
Posts: 6
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| 10 Aug 2006 13:31 Re: What is DMOS transistor? |
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Anyone can explain about this ?
I am dying to know about it. Any difference between LDMOS and DeMOS ?
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cloudius
Joined: 18 Oct 2005
Posts: 10
Helped: 1
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| 13 Aug 2006 15:43 What is DMOS transistor? |
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| good post
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tkyoo0220
Joined: 10 Aug 2006
Posts: 6
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| 28 Aug 2006 22:38 What is DMOS transistor? |
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DMOS and DeMOS is totally different. One is double diffused MOS and the other is Drain extended MOS.
I really want to get more info about DeMOS, not DMOS.
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cckan
Joined: 09 Dec 2004
Posts: 2
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| 14 Feb 2008 8:26 Re: What is DMOS transistor? |
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| What differences between SYM. DMOS and ASYM. DMOS?
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samajit123
Joined: 30 Aug 2007
Posts: 13
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| 10 Mar 2008 14:20 What is DMOS transistor? |
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| thankx for the information
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