1000 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: 3018
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: 675
as far as i thought ,,body effects makes the threshold voltage of mosfet changes,,,so,,you must care when placing the mosfets in series that they still operate in saturation region and this depend to a great extend on the supply voltage ;as it shrinks down ,placing mosfets in series becomes more difficult (...)
Electronic Elementary Questions :: 04-28-2006 04:09 :: husseinadel :: Replies: 3 :: Views: 2073
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 :: 08-18-2006 01:21 :: animeshjn :: Replies: 1 :: Views: 1556
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 :: 06-19-2007 07:14 :: A.Anand Srinivasan :: Replies: 5 :: Views: 1073
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 :: 06-03-2011 12:37 :: dgnani :: Replies: 5 :: Views: 1000
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 :: 11-08-2011 07:00 :: salil87 :: Replies: 0 :: Views: 624
Hello every one
I want to calculate the value of "Gamma" (body effect coefficient) of a MOS transistor using Cadence Virtuoso.I ran the DC analysis and checked the DC operating point parameters but can't find "Gamma".Would any body help please??
Analog IC Design and Layout :: 11-11-2013 07:26 :: h.jalali :: Replies: 2 :: Views: 520
Yes, but the normal situation in cascoding is to have the body effect. Using the bulk to source connection (no body effect) will increase the parasitic capacitance of the cascode node due to the required well to isolate bulks.
Analog IC Design and Layout :: 04-09-2005 05:09 :: bastos4321 :: Replies: 5 :: Views: 1139
Hi, all: I have a question when I read the book writed by Razavi. In the book, in page 140, there have a sentense in the last paragraph: Thus, if (w/l)3/(w/l)0=(w/l)2/(w/l)1, then VGS0=VGS3, VX=VY. Note that this result holds even if M0 and M3 suffer from body effect.
I do not know why when (w/l)3/(w/l)0=(w/l)2/(w/l)1, then VGS0=VGS3, VX=VY. a
Analog Circuit Design :: 10-13-2005 02:14 :: wjxcom :: Replies: 1 :: Views: 474
how to mitigate body effect in BJT ...normally by keeping low reverse voltage to collector base junction we can avoid it.. is there any other soultion in sight to mitigate it
Electronic Elementary Questions :: 12-28-2005 02:32 :: electronics_kumar :: Replies: 3 :: Views: 1342
the textbook tells me when Vbs=0 there is no body effect...
is anything changed?
Analog IC Design and Layout :: 11-07-2006 23:40 :: strennor :: Replies: 11 :: Views: 5695
Yes, you can. there are some papers talk about this body effect and sometimes it's called "back gate". do a google search and you will find more information.
Analog Circuit Design :: 07-27-2006 12:23 :: nxing :: Replies: 1 :: Views: 568
For a diode-connected load, why the input impedance seen at the source of NMOS is lower when we consider the body effect. If we don't try to derive the equation, do you have any intuitive explanation?
Analog Circuit Design :: 08-04-2006 02:14 :: yli :: Replies: 0 :: Views: 538
if i connect bulk of the headlight nmos Q1 to the source of it so as to eliminate body effect, is the circuit still able to operate right? If that, why do not people choose this scheme?
Electronic Elementary Questions :: 03-06-2007 03:25 :: yann_sun :: Replies: 1 :: Views: 815
using Deep-Nwell , the body effect will be relieved
Analog Circuit Design :: 03-22-2007 02:25 :: waxtomato :: Replies: 10 :: Views: 1086
Do you know how to find Vt, ro, uCox, and the body effect parameter when VGS = 0.9V?
Analog Circuit Design :: 04-04-2007 04:07 :: chichan :: Replies: 5 :: Views: 2350
If two nmos transistors are connected in parallell then wt is the effect of body effect?
If two nmos transistors are conected in series then we are saying that threshold is getting added bcoz of body effect... So wt we are doing is we are connecting Vsb =0 so that it gets reduced....
In the case of (...)
Analog Circuit Design :: 08-13-2007 23:41 :: mujju433 :: Replies: 5 :: Views: 2464
Having body effect is an advantage or disadvantage?
I think that it is advantage as well as disadvantage bcoz wen we consider the three series nmos transistors then bcoz of body effect that is Vsb =0 for the last transistor so the effect is les i mean the input can reach faster than the other two (...)
Analog Circuit Design :: 10-04-2007 19:23 :: mujju433 :: Replies: 2 :: Views: 1053
vt depends on the body bias. change of vt by body bias is the body effect. normally we connect n-mos body to gnd and p-mos body to supply making vsb zero. if you have many nmos devices in series as in nand gate, the body of the device which is close to gnd is at 0V and other (...)
ASIC Design Methodologies and Tools (Digital) :: 10-19-2007 17:12 :: sekapr :: Replies: 3 :: Views: 1913
What is the body effect for a single PMOS ???
ASIC Design Methodologies and Tools (Digital) :: 10-26-2007 15:01 :: cooldude040 :: Replies: 2 :: Views: 2503
Do we have body effect in NMOS and PMOS individually ??????????????????????
If yes why and how? plz explain me
ASIC Design Methodologies and Tools (Digital) :: 10-27-2007 03:28 :: cooldude040 :: Replies: 2 :: Views: 1607
Why BJT does not have body effect?
That is, why there is no gmb in BJT small signal model?
Analog Circuit Design :: 07-01-2008 11:51 :: joehwang :: Replies: 1 :: Views: 734
The rectifier block uses a cascaded Dickson voltage multiplier circuit with multiple cascaded sections in order to convert the extremely low input voltage up to a potential suffi cient for operating CMOS circuits.
The bulk terminals of the PMOS transistors were tied to the gate and drain terminals (back-bias) to reduce the effective threshold vol
Analog Circuit Design :: 08-26-2008 10:09 :: standup :: Replies: 0 :: Views: 599
Hi, every body,
I have a question that is about the source follower (common-drain amplifier) and body effect. Why does increasing the output bias level can reduce the percentage of source to bulk voltage due to the signal?
Could everybody explain the reason?
Analog Circuit Design :: 05-30-2009 13:51 :: davison7 :: Replies: 1 :: Views: 855
Can anybody please tell me the difference between the two figure of the NMOS transistor and what does body of each transistor determines about each transostor output....
Thanks in advance
Analog Circuit Design :: 06-01-2009 13:35 :: Irfansw07 :: Replies: 3 :: Views: 773
what is body effect in CMOS?and how it will come and how it will reduced?
ASIC Design Methodologies and Tools (Digital) :: 09-08-2009 05:37 :: vamsi_addagada :: Replies: 4 :: Views: 17570
I was studying mosfets and as i was reading Microelectronic Circuits by Sedra & Smith, I saw the concept of body effect. Now the body effect and why it is happening is clear, but there is one thing I didn't understand. When Vsb is increased Vt also increases so far so good but why the hell does drain current (...)
Analog Circuit Design :: 12-26-2010 12:43 :: albus :: Replies: 1 :: Views: 1103
In razavi's design of analog CMOS integrated circuit, chapter 3, it states/shows that body effect decrease the output resistance.
But I find it puzzling. I bias the NMOS source with a certain voltage, eg 0.3V.
Setup 1: Base and Source are connected together to 0.3V bias. (No body effect)
Setup 2. Source (...)
Analog IC Design and Layout :: 05-17-2011 12:20 :: surreyian :: Replies: 2 :: Views: 906
If we do the small signal analysis of
1. CS stage with source degeneration ( ie. additional resistor at the source terminal)
2. Source follower
3. Common gate stage
all the three have their source voltages varying as the input voltage varies, hence all of them would have influence of body effect. However, in th
Analog IC Design and Layout :: 06-18-2011 09:24 :: amir88 :: Replies: 1 :: Views: 448
I am trying to find a q point. There is a body effect, but my vtn is 1 anyways. What region of operation should I assume. Saturation region or triode region?
Assuming that your Vgs (gate-to-source voltage) is larger than Vtn, then the operation region only depends on Vds (assuming the basic square-law model). In tha
Analog IC Design and Layout :: 07-24-2011 08:38 :: analogLow :: Replies: 1 :: Views: 565
Why PMOS and NMOS in an nwell process have different body effect coefficients?
Analog IC Design and Layout :: 11-15-2011 06:10 :: Amy25 :: Replies: 1 :: Views: 1968
what is latchup ? and body effect ? in CMOS.....
ASIC Design Methodologies and Tools (Digital) :: 01-31-2014 02:01 :: shrikantec :: Replies: 1 :: Views: 391
You seem to have the sign reversed. Negative body voltage
(on NMOS) relative to source increases reverse-bias and
Analog IC Design and Layout :: 08-14-2014 13:28 :: dick_freebird :: Replies: 4 :: Views: 311
In the layout,the source and the drain are indentical,why we don't consider the body effect caused by Vdb>0?
Analog Circuit Design :: 11-18-2014 08:39 :: MelZ :: Replies: 6 :: Views: 365
Never heard of "couple effect". Do you mean "body effect"?
Analog Circuit Design :: 06-08-2012 11:13 :: crutschow :: Replies: 1 :: Views: 341
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 :: 05-01-2013 02:59 :: nitishn5 :: Replies: 2 :: Views: 351
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 :: 11-20-2004 19:57 :: wwfieee :: Replies: 1 :: Views: 7193
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 :: 06-27-2008 01:48 :: neils_arm_strong :: Replies: 0 :: Views: 1329
... 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 :: 09-10-2010 09:14 :: erikl :: Replies: 8 :: Views: 5045
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 :: 04-16-2012 10:52 :: dick_freebird :: Replies: 2 :: Views: 736
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: 679
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 :: 11-13-2012 07:32 :: erikl :: Replies: 4 :: Views: 748
can any one explain about non-ideal characteristics of a mosfet
Channel Length Modulation?
ASIC Design Methodologies and Tools (Digital) :: 02-18-2013 05:42 :: RGR :: Replies: 0 :: Views: 339
what are some advantages and disadvantages of drain extended mosfet over standard low voltage mosfets? assuming I am using these for a common drain amplifier for both high and low voltages?
does drain extended mosfet have body effect?
Electronic Elementary Questions :: 10-11-2014 16:02 :: flabbergastt :: Replies: 1 :: Views: 239
A float nwell is usualy used to cancel body effect in PMOS diferential parir in amplifiers.
The problem is that this well has a capacitance to substrate that has at least two effects:
1- Injection of substrate noise in the node.
2- PSRR gets degradate due to the lower pole frequency in that node.
I do not understand the anwsers (...)
ASIC Design Methodologies and Tools (Digital) :: 06-16-2003 09:29 :: bastos4321 :: Replies: 7 :: Views: 4347
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 :: 07-15-2004 17:37 :: electronrancher :: Replies: 10 :: Views: 2507
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 :: 03-25-2005 09:53 :: Alles Gute :: Replies: 15 :: Views: 6820
How do i calculate body effetc of cmos?
Mathematics and Physics :: 09-24-2005 11:13 :: shermaine :: Replies: 2 :: Views: 2308
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 :: 12-13-2005 20:24 :: vhdl00 :: Replies: 8 :: Views: 1433