1000 Threads found on edaboard.com: Mosfet Transconductance
What are you doing?
You can use your mosfet switch to limit the inrush current. Look up mosfet transconductance, for a given Vgs a mosfet will allow a certain Ids.
The reason there is an inrush is because when you first flip the switch to your SMPS the bulk input capacitor is discharged the inrush current is the (...)
Analog Circuit Design :: 11-20-2008 15:35 :: max0412 :: Replies: 5 :: Views: 4300
.i modify gate voltage to mos transistors,therewith the high mos resistance is controlled ,and the fc is further on controlled.:D
In weak inversion the mosfet transconductance is given by "Id/nKT" i.e. independant of Vgs. So assuming you are using MOS as R or simillar to OTA-C implementation, the Res = 1/gm. So
Analog Circuit Design :: 10-01-2009 07:53 :: zopeon :: Replies: 3 :: Views: 707
Can anyone help me to provide to find parasitic capacitances Cgd,Cgs, Cgg, etc and transconductance of mosfet using hspice? i need the command to use during analysis in hspice synopsys...
Electronic Elementary Questions :: 08-05-2014 11:28 :: gomathi gomu :: Replies: 0 :: Views: 119
mosfet is voltage drive device, what's the point of measuring Ft? And what is the usage of Ft for mosfet?
RF, Microwave, Antennas and Optics :: 05-29-2005 23:58 :: _RFIC_ :: Replies: 1 :: Views: 982
The main different is that the JFET have a PN juntion for it have high input impedance.
The mosfet have isolated gate with polysilicon.
Electronic Elementary Questions :: 06-30-2005 11:44 :: JoseLeonardo :: Replies: 10 :: Views: 48509
I have a few questions about fMAX and fT of a mosfet:
1. What's the definitation of fMAX, the maximum oscillation frequency of a mosfet?
2. I remember the definition of cut-off frequency fT is the frequency when current gain Iout/Iin = 1. This gives out fT = gm/Cg. My question is: is transconductance gm a function of frequency? (...)
Analog Circuit Design :: 04-25-2006 20:46 :: jlee :: Replies: 2 :: Views: 11731
Mr.venkat3271 for ur kind information the drain current Id of a mosfet depends on the effective voltage.... please do refer some material on mosfet.....
Electronic Elementary Questions :: 06-21-2007 13:47 :: A.Anand Srinivasan :: Replies: 3 :: Views: 995
Why mosfet IS OPERATED in Saturation region in most of the analog applications? please explain with some references..
Analog Circuit Design :: 02-11-2008 04:14 :: sandeep_sggs :: Replies: 1 :: Views: 1867
un, up, Cox are all parameters that are dependent on the process. You dont get to select them unless you use a different process. The only control an Analog Circuit Designer has on the mosfet is the size and bias current (or voltage).
Analog Circuit Design :: 08-26-2008 23:14 :: ytliang :: Replies: 3 :: Views: 1355
I'm new to mosfets and mosfet-drivers and would just like to check if I correctly determined the correct mosfet + driver to use using the correct calculations.
Any criticism/suggestions are welcome. Thx in advance!
mosfet H-bridge Driver: MC33883
Analog Circuit Design :: 04-18-2009 13:58 :: Rewn :: Replies: 0 :: Views: 982
Simple first order model for mosfet current:
Id=K*(VGS-VT)^2 (in saturation)
where K depends on W and L (transistor width and length respectively)
when VGS varies, Id can be held constant by adjusting W (device's width)
Analog Circuit Design :: 07-12-2009 17:00 :: saruman1983 :: Replies: 18 :: Views: 17368
Do you know the relationship between transconductance (u*Cox) parameter and technology?
In other words how does change that parameter for a mosfet in .25 micron to 0.18micron?
Analog IC Design and Layout :: 04-01-2010 10:33 :: ahmadagha23 :: Replies: 11 :: Views: 2100
which transistor provide more gain...Enhancement mosfet or Depletion mosfet? Please explain with solid reasons.... :) :)
Electronic Elementary Questions :: 06-28-2011 15:54 :: raditsme :: Replies: 1 :: Views: 806
I need to plot transconductance(gm) of a mosfet(NMOS) in LTSPICE. Any idea how to do it? I am using TSMC 0.18um technology file.
Also I need to observe gm upto 5 figures of precision. Please help me with that too...
Right now I can view gm using dc operating point (.op) and going to Menu Bar->View->Spice Error Log (screenshot attached)
Electronic Elementary Questions :: 04-01-2012 07:56 :: nyk :: Replies: 0 :: Views: 1256
I'm looking for Toshiba and Hitachi lateral power mosfet models. Does anyone have any available or know a source for these?
PCB Routing Schematic Layout software and Simulation :: 12-24-2002 01:41 :: 2bulldog :: Replies: 1 :: Views: 1538
I have been using Multisim and its prior versions for a good number of years. Multisim comes with a good number of IRF mosfet models, but an extremely limited number of 2SK and 2SJ mosfet models.
Does any one have good modes for 2SK and 2SJ parts that they can share, or perhaps provide a link to? I have done many searches for these and have neve
PCB Routing Schematic Layout software and Simulation :: 12-24-2002 14:21 :: 2bulldog :: Replies: 1 :: Views: 4054
Each mosfet model has its merits and drawbaks, like accuracy or simulation time, thus converting them maybe loss the accuracy.
some programs like @dv@nced D esign Sys. can open all spice format like HSpice or PSpice without any problem like mosfet modeling incompatibility,also this new softs. have a large number of known and common
PCB Routing Schematic Layout software and Simulation :: 01-23-2003 05:20 :: goodboy_pl :: Replies: 5 :: Views: 2266
in fact,you problem is not so easy.but if you want low power dispension,maybe mosfet is the only way.you can use four 20V 0.005 oum mosfet parallel,get a very low instance, only about 1W dispension,and four SO8 chip mosfet can work well with about 30 degree temprature warry about others,if you find a error in one power modle,you should shut
Professional Hardware and Electronics Design :: 02-16-2003 23:12 :: shanren :: Replies: 12 :: Views: 2974
Need to shut down a small signal dual gate mosfet amp
the idea is to switch off the amp during transmit in a transciver ?
Professional Hardware and Electronics Design :: 03-08-2003 16:32 :: bobcat1 :: Replies: 1 :: Views: 1057
for mhz range u can increase efficiency by using "Low Charge" mosfets like IRF740LC by International Rectifier.
they have LC suffix in their part number.
for rf simulation with LC tanks it is better to use harmonic ballance simulation rather than transient; it is fast and accurate.
u can simulate your ckt with Microwave Office, Serenade or A
RF, Microwave, Antennas and Optics :: 09-22-2003 06:46 :: goodboy_pl :: Replies: 5 :: Views: 20719
Are there any ic's that contains 4 mosfets in it which can stand 4-5A at 55V?
Robotics and Automatics Forum :: 09-27-2003 15:47 :: seyyah :: Replies: 7 :: Views: 3985
Someboby know how can i do to have the same fonction than a NPN PNP push pull design with N&P channel mosfet (4Mhz input signal) ??
RF, Microwave, Antennas and Optics :: 10-07-2003 13:03 :: bobytronic :: Replies: 2 :: Views: 1572
How we can reduce mosfet leakage current for both P and N channel.
Im designing low power equipment.
Actualy Si3443DV and FDC6305 have more leakage current at VCC=3V.
Can anyone tell me how we can reduce it or replacement for the same
Professional Hardware and Electronics Design :: 12-02-2003 02:27 :: niks :: Replies: 0 :: Views: 1699
I need P channel mosfet with IDss less than 5uA @ 75/85 degree
IF u know any FET let me know.
Professional Hardware and Electronics Design :: 12-02-2003 08:05 :: niks :: Replies: 0 :: Views: 1208
Hi.. You could use mosfet drivers which are specifically design to do the job. Linear techbology has very good one for N or P channel FETs.
International Rectifier has very good one too..
Makes your work easy and a finished reliable product.
Professional Hardware and Electronics Design :: 12-28-2003 17:52 :: henrik2000 :: Replies: 25 :: Views: 16368
I am trying to drive a mosfet in a dc-dc boost converter. Does anyone have a design that I can use in PSpice, or is there a chip already available in the PSpice library?
Hobby Circuits and Small Projects Problems :: 12-08-2003 14:10 :: ee01akk :: Replies: 2 :: Views: 2414
i want a N-ch mosfet with foll. specs-
IDss <<0.5uA @ Vd=3V. IM looking for SOT23, 3 lead package or smaller one.
can anyone suggest me
are u shure that idss smaller the 500 nanoamper ????????
Professional Hardware and Electronics Design :: 01-13-2004 12:52 :: eladg :: Replies: 5 :: Views: 1443
In theory this would be possible however you did not mention if it is a P or N channel mosfet?
I would think that it is best to drive your power mosfet with a driver from linear technology (linear.com) or from international rectifier (ir.com).
The heavy capacitance present on the gate may slow down things badly.
As you did not mention which
PLD, SPLD, GAL, CPLD, FPGA Design :: 01-20-2004 12:11 :: henrik2000 :: Replies: 3 :: Views: 760
I need some help,
when you need hi power, in aplications like Hi power-current dc-dc converter, it's necesary to parallel the mosfet transistors to get more current and power, I need to know how is the formula or calculations, to know how quantity of mosfet that I need to specific current and power ????
in the example, it's use 4 7
Professional Hardware and Electronics Design :: 01-24-2004 13:27 :: MCMC :: Replies: 13 :: Views: 8231
Are there any programs to convert the hspice model to the spectre model?
The mosfet models in MOSIS are only for HSPICE.
It takes long time to convert them manually.
Thank you in advance.
Analog Circuit Design :: 01-27-2004 11:17 :: sck236 :: Replies: 0 :: Views: 1620
i want to know which mosfet will be best to design 100W power amplifier in the frequency range of 88 MHz to 108 MHz.
RF, Microwave, Antennas and Optics :: 02-12-2004 22:37 :: jsp :: Replies: 6 :: Views: 2759
Please suggest a cheap and commonly avaialable P-channel mosfet with following minimum requirements
RDSon < 250mohm
Operation voltage 32Vdc max
Operation current 6A peak (for 15% duty cycle only), 0.8A average
Switching frequency = 60Hz only
thanks / techie
Professional Hardware and Electronics Design :: 03-03-2004 03:08 :: techie :: Replies: 9 :: Views: 3621
I have read some tutorials. I saw in the DC simulation controller that in Other, they can set something like to get Gm for the mosfet but I dont know how to set it. Also in TSMC library, how can I get Gm, Cox, Tox for the mosfet in ADS, thank you very much.
Analog IC Design and Layout :: 03-31-2004 16:00 :: boy :: Replies: 10 :: Views: 4803
All the circuits show Transistor for current boost with 78xx 3 pin regulator. Why don't they use mosfet instead of Transistor.
Hobby Circuits and Small Projects Problems :: 04-07-2004 07:43 :: palesha :: Replies: 1 :: Views: 1829
Someone knows how to build a mosfet based solid state relay to be used with ac voltage?
Hobby Circuits and Small Projects Problems :: 04-16-2004 16:57 :: vivaldez :: Replies: 4 :: Views: 2561
I am designing an input stage of an Op Amp. I need to measure the transconductance Gm of the whole input stage. Can somebody give me a suggestion how to get Gm in Hspice or ADS? Thank you very much in advance.
Analog IC Design and Layout :: 04-20-2004 00:20 :: eeAmateur :: Replies: 6 :: Views: 7570
Rf mosfet can get a large current
Why you should rf mosfet instead Power mosfet?
RF, Microwave, Antennas and Optics :: 05-18-2006 04:17 :: devil_electric :: Replies: 3 :: Views: 1194
By the way, all mosfets have a body diode, it's how thay are made. There aren't any without.
All Jfets have not body diode.
There are no Jfet for high power and high voltage....
Analog Circuit Design :: 05-22-2004 18:13 :: bastos4321 :: Replies: 7 :: Views: 13749
I have encountered a circuit whereby I could not understand how does it suppose to work.
There are 2 similar P-Channel mosfet (Vishay Si1413) which I shall termed it as Q12 & Q15.
Both mosfet have their gate connected to a single control point which means if a low is applied, both mosfet will be turned on.
Drain of Q12 : DC (...)
Analog Circuit Design :: 05-18-2004 10:32 :: ayeong :: Replies: 5 :: Views: 2292
Where can i find and download the book "Motorola power mosfet transistor data book" ?
Analog Circuit Design :: 05-22-2004 22:46 :: ahz :: Replies: 1 :: Views: 2104
Could anybody advise me on mosfet driving circuit ?
Based on datasheet, it is true that the higher the VGS for a N-Channel mosfet will result in a lower RDS(on) ?
And if that's the case, isn't it will be much easier to operate a P-Channel mosfet than N-Channel since it only require a low on the gate ?
Where do we usually find (...)
Analog Circuit Design :: 06-12-2004 15:02 :: ayeong :: Replies: 10 :: Views: 3874
hi, when i select a mosfet, which parametere should i pay more attetion to?
thansks and regards
Electronic Elementary Questions :: 06-14-2004 04:02 :: ilikebbs :: Replies: 3 :: Views: 1450
You may want to refer to the following links for some application notes on mosfet.
Electronic Elementary Questions :: 06-23-2004 20:30 :: ayeong :: Replies: 17 :: Views: 7260
mosfet is a transistor technology. It is an extention of the field-effect transistor (FET).
As with bipolar transistor, where you have NPN and PNP, you can have two kind of FET (P-channel and N-channel).
When creating integrated circuits, using mainly P-channel mosfet transistors, the device is called 'PMOS'. Similarely, when using mainly N
Electronic Elementary Questions :: 06-23-2004 13:32 :: Big Boy :: Replies: 12 :: Views: 23449
Just wondering what it means when a mosfet is level 1 or 2 or so on. Im designing a comparator using B2 Spice and from what i can gather i can not adjust the W/L ratios of the models supplied with the program. To input the W/L ratios i have to design a mosfet from scratch. ie. need to input all parameters required for a mosfet. I need the (...)
Analog Circuit Design :: 07-01-2004 01:41 :: cjupiter :: Replies: 1 :: Views: 1200
Is there any good papers or books on power mosfet, both on design and test.
Electronic Elementary Questions :: 07-16-2004 21:30 :: dumbfrog :: Replies: 3 :: Views: 1179
what choices are available for driving a full bridge mosfet topology. (formed using four irfz46n mosfets)
Also i wonder if there are power mosfets (up to 20A at 30V) that can be driven directly and effciently from the ?c ?
Professional Hardware and Electronics Design :: 08-02-2004 16:59 :: seyyah :: Replies: 6 :: Views: 3677
OTA -> Operational transconductance Amplifier.
An OPAMP is Voltage Controlled Voltage Source thus u can not connect output of them together but the output of VCCS (Voltage Controled Current Source) can be connected together, cos if the input voltage of any of them is zero, then the output is open circuit.
u can use a simple jfet, mosfet or even a
Analog Circuit Design :: 08-12-2004 00:05 :: goodboy_pl :: Replies: 9 :: Views: 1311
that was exactly the answer i was thinking of when u asked for high side driver. but then i saw your circuit. i think you will run into a couple of problems when trying to use that king of circuit normally reserved for power switch application and not high side drive of a half bridge. half bridges are usually used because of high power and high
Hobby Circuits and Small Projects Problems :: 09-17-2004 20:34 :: Mr.Cool :: Replies: 16 :: Views: 22319
It looks like you are making a constant current source or current limiter. You will need to use a P type mosfet for the series pass transistor and put the source to the input and the drain to the output.
This is a good situation where SPICE type simulators are very good because you can examine the simulated currents. PSpice has a free studen
Electronic Elementary Questions :: 10-04-2004 00:29 :: flatulent :: Replies: 3 :: Views: 3544