47 Threads found on edaboard.com: Body Effect Mosfet
The derived equation for gm is assumed to be in body effect existing condition, then it is not correct when vsb = 0
Analog IC Design and Layout :: 05.05.2005 08:23 :: amir_se :: Replies: 4 :: Views: 2814
how to avoid occurance of Miller and body effect in BJT..?
SOLUTIONS ARE WELCOMED
Electronic Elementary Questions :: 12.12.2005 04:00 :: electronics_kumar :: Replies: 1 :: Views: 655
Does the body effect of a process limit the number of transistors that can be placed in series in a CMOS gate at low frequencies?
Electronic Elementary Questions :: 23.04.2006 11:39 :: aamirfattah :: Replies: 3 :: Views: 1914
In both body effect and DIBL, the width of deplition region increases, but in body effect the threshold voltage increases while in DIBL Vth decreases, Why???
Electronic Elementary Questions :: 18.08.2006 01:21 :: animeshjn :: Replies: 1 :: Views: 1425
The body effect describes the changes in the threshold voltage by the change in VSB, the source-bulk voltage of the mosfet. Since VSB influences the channel and hence the Threshold voltage (when it is not tied to the source), it can be thought of as a second gate, and is sometimes referred to as the "back gate"; the body (...)
Electronic Elementary Questions :: 19.06.2007 07:14 :: A.Anand Srinivasan :: Replies: 5 :: Views: 1021
i use 0.18UM180FDKMFC-FDK
in my design i have to avoid body effect so i need to connect the bulk terminal of NMOS to its source
but the problem is the process is twin well
so can i use RF mos in the kit?it has 4 terminals (s,D,G ,B) , when i see RF transistor layout it has a layer called DNW ,does it mean "deep n well"??? an
Analog IC Design and Layout :: 03.06.2011 12:37 :: dgnani :: Replies: 5 :: Views: 967
I found on my notes that for an NMOS with increase in Vsb voltage body effect increases, Vt also increases. But it is mentioned that with Vgs constant id increases which I feel is wrong since id is proportional to (Vgs - Vt)2. Hence I think id should decrease. Please show me the ligh
Electronic Elementary Questions :: 08.11.2011 07:00 :: salil87 :: Replies: 0 :: Views: 601
Does anyone have a reasonable Pspice model for the CD4007 mosfet Array? It would be nice if the model also include the body effect. Thanks.
Electronic Elementary Questions :: 20.11.2004 19:57 :: wwfieee :: Replies: 1 :: Views: 6774
Can someone tell me how to vary the threshold voltage of mosfet in hspice.
Is it enough if i give a value for Vth0. I tried this
M1 d g s s w=x l=y vth0=z
But this kind of declaration is not changing the vth value.All this time i have been giving some substrate voltage and getting the required vth( body effect). Is there any (...)
Electronic Elementary Questions :: 27.06.2008 01:48 :: neils_arm_strong :: Replies: 0 :: Views: 1273
... why should S-oriented device have higher vt?, as both need same voltage(Vgs) to form inversion layer.
This is not correct, sorry: The threshold voltage Vt of a mosfet doesn't depend only on the gate control, but additionally on bulk control (which in this case is the well) - called the body-effect.
Analog IC Design and Layout :: 10.09.2010 09:14 :: erikl :: Replies: 8 :: Views: 4658
"... Drain current .... increased due to immobile cahrge in the depletion region"
What is effect of Vth then? Is should reduce drain current?
I know that, back gate effect increase the trance conductance looked at source.
Expect if you can elaborate your point.
Analog IC Design and Layout :: 16.01.2012 14:40 :: erikl :: Replies: 11 :: Views: 1546
I simulated 4-stage Charge pump with dynamic CTS.
When I have given 1.8V of input voltage, I observed 7.72V as output when the NMOS bulk is connected to ground and PMOS bulk connected to drain.(Highest potential)
At the same time, I observed 8.3V as output when NMOS bulk and PMOS bulk are connected to source.
Can you please let me
Analog IC Design and Layout :: 06.03.2012 20:26 :: shaikss :: Replies: 3 :: Views: 628
Look up "body effect". -Vbs adds to VT at about a 0.6 scale
factor (Vbs being -1V, increases VT by about 0.6V). The
real number may be found in the model card.
Forward bias gives you a lousy BJT, where you probably
didn't want it.
Analog Circuit Design :: 16.04.2012 10:52 :: dick_freebird :: Replies: 2 :: Views: 673
i want to know how to extract mosfet parameters e.g:(Vt,gamma,body effect coefficient,lambda...)
"i know it may be a repeated thread but i already read the related threads and it cant help"
so, i am using orcad capture cis & i am using MTP6N60 and i want to know from where to start .....
Analog Circuit Design :: 06.06.2012 18:45 :: kumite :: Replies: 2 :: Views: 651
Never heard of "couple effect". Do you mean "body effect"?
Analog Circuit Design :: 08.06.2012 11:13 :: crutschow :: Replies: 1 :: Views: 317
I'm a student and im weak in electronics and electric issues ( i like computer science and programming )
I have problem and can't solve it , i tried hard but nothing solved yet
it might be easy but my mind stuck and give no solutions ..... plzz help me !! dont give me answers just the hints
assume kn = 120 , Vtn0 = 1V , c
Electronic Elementary Questions :: 05.11.2012 15:34 :: lkht :: Replies: 2 :: Views: 329
BSIM3v2 models apparently model the mosfet's breakdown voltage through the anti-parallel body-diode's BV parameter.
If you need separate diodes for source and drain, s. the following page from the BSIM4v62 manual and use dioMod=0 or dioMod=2 :
Analog IC Design and Layout :: 13.11.2012 07:32 :: erikl :: Replies: 4 :: Views: 692
can any one explain about non-ideal characteristics of a mosfet
Channel Length Modulation?
ASIC Design Methodologies and Tools (Digital) :: 18.02.2013 05:42 :: RGR :: Replies: 0 :: Views: 303
The body of an NMOS is connected to the lowest voltage point in the circuit and for the PMOS the highest voltage point. which are usually the sources.
The reason is as follows.
Consider an NMOS. The body or substrate is p type and the source and drain are n type.
If the substrate is at a higher voltage than the source/drain than the (...)
Electronic Elementary Questions :: 01.05.2013 02:59 :: nitishn5 :: Replies: 2 :: Views: 316
Channel length modulation , body effect , ssubthreshold region
iam asking about why these effects titled " Second order effects "?
what is the reason of this naming ?
Electronic Elementary Questions :: 02.05.2013 07:35 :: MahmoudHassan :: Replies: 3 :: Views: 1496
for a standard LDO - yes, a bigger mosfet is the only way to reduce dropout.
some advanced methods are to:
-use low-threshold or depletion device as pass transistor
-body boost (modulate the tank voltage in order to make body effect lower Vt)
-charge pump the gate higher than Vin.
Analog Circuit Design :: 15.07.2004 17:37 :: electronrancher :: Replies: 10 :: Views: 2435
vt is a parameter of channel lenght in both pmos and nmos. this effect is called channel modulation effect considered with parameter lambda in the equation of cmos current equation.
the best way to bypass this altering effect is to connect source to bulk of the mosfet.
I think what you said should be (...)
Analog IC Design and Layout :: 25.03.2005 09:53 :: Alles Gute :: Replies: 15 :: Views: 6700
i run hspice simulations recently, found that the threshold voltage is different for same device, i mean other than body effect, is there any other factors affect threshold voltage?
Analog Circuit Design :: 13.12.2005 20:24 :: vhdl00 :: Replies: 8 :: Views: 1350
JFET has low GS resistance. (GS has junction)
mosfet high GS resistance (GS no junction)
JFET for small voltage and current applications. (Usually you can not find power JFET at the market)
mosfet has reverse body diode. JFET hasn't.
Analog Circuit Design :: 02.11.2006 08:32 :: bunalmis :: Replies: 6 :: Views: 4132
Here are some Questions.........
Explain why & how a mosfet works
Draw Vds-Ids curve for a mosfet. Now, show how this curve changes (a) with increasing Vgs (b) with increasing transistor width (c) considering Channel Length Modulation
Explain the various mosfet Capacitances & their significance
Draw a CMOS Inverter. Explain its
ASIC Design Methodologies and Tools (Digital) :: 10.04.2007 08:21 :: Guru59 :: Replies: 8 :: Views: 6962
the parasitic diode of mosfet or the body diode is the due to the PN junction formed between the source and the gate.... this usually causes latchup when left open and is connected to the lowest supply to avoid latchup but due to its reverse capacitance and diode nature it causes trouble... so generally body and source are shorted to (...)
Electronic Elementary Questions :: 30.07.2007 12:47 :: A.Anand Srinivasan :: Replies: 7 :: Views: 5117
If you vary the parameter W and L you change the current passed in the active region, if you change the body voltage you change the transconductance of the device and, if you are using it as amplifier, you change the gain and you can change its state of operation, e.g you can get a MOS off if the body voltage is too high and makes the Vt value goes
Analog Circuit Design :: 23.08.2007 20:30 :: Andrew8611 :: Replies: 5 :: Views: 583
Agree with yxo.
It is empiric rule.
But PMOS for diff-input-pair still has its merit such as no body-effect, low 1/f noise.
Analog IC Design and Layout :: 10.10.2007 05:00 :: Alan_Nesta :: Replies: 11 :: Views: 2758
In my design, the power mosfet is integrated on the chip. We have the concern the body diode of the power mosfet will have adverse effect for the performance.
I wonder if this effect can be represented in the simulation? Put another words, in normally, the body diode is imcluded in (...)
Analog IC Design and Layout :: 29.01.2008 00:48 :: chang830 :: Replies: 0 :: Views: 898
Can somebody elaborate on the "basics" that one must absolutely be aware of, to learn analog circuit design?
Let's break it down to each topic...say
1) Single Transistor Topologies
2) Diff Pair
3) Current Mirrors etc..
What is the "experienced" view on this? Does everyone begin with a paper-pencil approach or an "intuitive" understan
Analog IC Design and Layout :: 08.03.2008 06:25 :: bunda_bindaas :: Replies: 13 :: Views: 2280
the file u provide is level49, is hard to compare to hand calculation for acedemic purpose.
not sure who else got level 2 process file.
i just need few parameter to be in for my simulation.
Gamma and Phi to count in body effect?
please help and it is urgent.
---------- Post added at 16:07 ---------- Previous post was at
Software Problems, Hints and Reviews :: 08.12.2011 02:07 :: yongchun :: Replies: 2 :: Views: 1517
My understanding is that Vth not only depends on the process corners but also on the mosfet aspect ratio(neglecting body effect). To test out statistical variations, I think you can use the gaussian distribution with the the mean set to your Vth0 and a +Sigma,-Sigma set to their 0.34% of the mean.
NOTE: AFAIK, a good layout design can (...)
Analog IC Design and Layout :: 25.01.2009 09:02 :: kishore2k4 :: Replies: 2 :: Views: 1517
Please any body explain clearly what is dv/dt and "shoot-through"in mosfet/IGBT. How these effect on IGBT/mosfet.
V. Naresh Kumar
Analog Circuit Design :: 03.05.2009 12:48 :: nareshgtr :: Replies: 1 :: Views: 5086
Read up on body effect. Some designs make use it for sub-threshold operation. Some want to eliminate it by shorting the body to source, especially in cases where you do not have enough headroom.
Analog IC Design and Layout :: 26.11.2010 10:58 :: checkmate :: Replies: 4 :: Views: 2853
1） Vgs-Vds? it depends operating point that the circuit works.
2) PMOS's body can be connected to source or Vdd according the circuit design requirement. It might lead to Vth increase if the body voltage is not equal to source voltage. It is called body effect that can be found for details in any basic analog circuit (...)
Analog IC Design and Layout :: 23.04.2011 07:44 :: leo_o2 :: Replies: 41 :: Views: 3739
I don't have Razavi's book off hand, but my guess is that he was using a resistive load. Notice the words "may" and "For example".
For your first answer, the current is given by (Vin-Vgs)/R. In this case, he was stating the numbers from a hypothetical R load that will give the mentioned figures.
For the second answer, refer to the first one. If the
Analog IC Design and Layout :: 20.06.2011 10:01 :: checkmate :: Replies: 7 :: Views: 889
I think theshold voltage is better to be define with Vgb instead of Vgs.
Actually body effect is used to reflect it.
Analog IC Design and Layout :: 05.08.2011 23:20 :: leo_o2 :: Replies: 7 :: Views: 1422
mosfet or Metal Oxide Semiconductor Field effect Transistor is basically a transistor, generally used for amplification of switching of Electronic Signals. It generally has four pins, Source; Gate; Drain and body , but in some devices the body and Sources are interconnected to make it three pins.
IC or integrated Circuit: (...)
Electronic Elementary Questions :: 28.05.2012 06:20 :: SUMIT_GAMBHIR :: Replies: 3 :: Views: 307
Vs will depend on what is attached to it. Is the source attached to a resistor? Is it attached to GND? Is it attached to a voltage source? Is it attached to a capacitor?
Additionally, depending on what it's connected to, the answer may depend on threshold Vgs, carrier mobility, gate capacitance, mosfet dimensions, lambda, and body (...)
Analog IC Design and Layout :: 23.07.2012 11:33 :: ZekeR :: Replies: 1 :: Views: 312
Any body know about how can i measure the load through mosfet(parallaly connected) without using CT coil and Hall effect sensor .
i mean am going to switch this mosfet through 50Hz square pulse and load may be approximately > 2KVA (so shunt res not possible to measure load).
i want to know, how to find the load across (...)
Power Electronics :: 17.12.2012 00:58 :: ismu :: Replies: 3 :: Views: 240
The mosfet allows the current to flow in both directions when it's on. The combination used here is meant to eliminate the effect of the body diodes when the D-S voltage is reversed.
So, yes this circuit can be used as a bidirectional switch. Just make sure the control voltage is always applied between the sources and the gates, with (...)
Analog Circuit Design :: 14.10.2005 12:22 :: VVV :: Replies: 3 :: Views: 1462
Short circuit is not discussed in the features of this circuit, only overcurrent protection is provided. (Of course overcurrent may include current caused by a short circuit.) See points 11.4 11.5 and 11.6 on page 8 of your link.
So you have to remove the extra load that has caused the overcurrent or reduce the effect of the load by i
Analog Circuit Design :: 28.11.2007 12:01 :: unkarc :: Replies: 2 :: Views: 1058
CAN ANY body GIVE ME GOOD DOCUMENTATION ON SHORT CHANNEL effectS PLEASE.
Analog IC Design and Layout :: 19.03.2008 00:42 :: sridhar540 :: Replies: 3 :: Views: 839
It is all explained in the BSIM4.6.0 mosfet Model - Users' Manual
K2 = Second-order body bias coefficient
LPEB = Lateral non-uniform doping effect on K1
and many more. I think the BSIM models have more parameters than any other device.
Analog IC Design and Layout :: 21.05.2008 00:03 :: RealAEL :: Replies: 2 :: Views: 1270
i am searching for an books about cmos analog design which can help
i like those topics :
2-fabrication topics "VLSI"
i like books that have detailed analysis
and if there any books for the problems of mosfet like dumble effect,chockli diode,...............(device) it will be great
only give me
Analog Circuit Design :: 19.03.2009 17:42 :: mr_byte31 :: Replies: 3 :: Views: 515
Alot of mosfets come with a built-in diode across the source and drain. The attached diagram outlines what I mean. I would like to confirm that the purpose of this diode is to allow the mosfet to handle reverse current to flow.
No, it's to indicate source is internally connected to body of mosfet.
Power Electronics :: 01.02.2011 04:44 :: DineshSL :: Replies: 19 :: Views: 2393
Just as the gate "pushes" on the body - accumulating,
depleting or inverting it - so does the body "push" on the
gate. If there is a depletion region in the poly, that adds
to the effective Tox, in a sense.
Gate poly implanted from above, tends to have less
dopant at the top gate interface (you could position
the peak at the interface, (...)
Analog IC Design and Layout :: 02.05.2013 12:39 :: dick_freebird :: Replies: 2 :: Views: 322