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Body Effect In Cmos

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what is body effect in cmos?and how it will come and how it will reduced?
in the cmos there are intrinsic bipolar bjts. if you check the diagram of the cmos with n well you can see that the source and drain of the pmos is p+ and the well is n. and the substrate/body is ptype. so it can work as a pnp transistor. similarly there are other intrinsic bjt's. these are called parasitic transistors as they usually badly (...)
using Deep-Nwell , the body effect will be relieved
Do we have body effect in NMOS and PMOS individually ?????????????????????? If yes why and how? plz explain me
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
the textbook tells me when Vbs=0 there is no body effect... is anything changed?
The derived equation for gm is assumed to be in body effect existing condition, then it is not correct when vsb = 0
How do i calculate body effetc of cmos?
how to avoid occurance of Miller and body effect in BJT..? SOLUTIONS ARE WELCOMED
Hi can anybody elobarate on this (MTcmos) specific applications.
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.
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 increases when (...)
Dear All, 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
Hi can anyone tell me what is body effect in cmos? and what is meant by process in PVT conditions.. thanks in advance Check the below link for a brief description of process, voltage and temperature variations, ASIC-S
hi guys, i am highly confuse that why do ground body pin of R, C & L in cmos device, but i know the reasion for actice device. but 4 passive i dont know the reasion. thanks In order to model the parasitic effect of these passive devices we need 3 terminals.... Now, the question is where do we want to connect
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 check this also
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 (...)
Hi, When two NMOS transistors are connected in series then the NMOS tarnsistor in the top transistor experiences higher body effect because its Source terminal is not at VSS value. But when two NMOS transistors are connected in parallel then the body effect each experience is same as that of a single NMOS transistor.
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
Hello all, 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) (...)
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?? Thank you
In the layout,the source and the drain are indentical,why we don't consider the body effect caused by Vdb>0?
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. Bastos
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
In addition to artem's post: You can use charge pump, but remember about your substrate. If your substrate is p-type you have to apply to the substrate the most negative voltage, so body terminal of all NMOS transistors in your design should be connected to this pumped negative voltage.
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???
What are "hot electrons" in cmos?
Hi, 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?
Hi, Do you know how to find Vt, ro, uCox, and the body effect parameter when VGS = 0.9V? Please help. Chi
Can anyone explain me the "crowbarred" condition in cmos
Hi all, Can any body help me in designing 5Ghz PLL in cmos, Im using 0.18u.
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 (...)
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 (...)
Dear Dude, body effect Normally the source and substrate must be at same potential. If it is P substrate then it must be connected to negative terminal if N substrates it must be connected to Positive terminal because the PN junction between the diffusion and substrate must be reverse biased. Then only it is possible to control the flow of
Some circuit needs resistor to adjust voltage vallue. Especially, resistor used in Voltage divider circuit. In cmos process, process variation of resistor is too large to ignore. in additional to Aread of Resistor is big compare to NMOS or PMOS Nevertheless, Why We use Resistor in Voltage divider circuit instead of MOS? May w
as title, Why BJT does not have body effect? That is, why there is no gmb in BJT small signal model? Thanks!
I agree with electronrancher. You can consider normal NMOS. The body diode will be forward-biased if its drain is negative.
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
hi 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
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
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
The body-effect factor γ depends on its bulk doping concentration NB , which of course is different for PMOS and NMOS transistors: \gamma = {\sqrt{2q\varepsilon_{Si}N_B }\over{C'_{ox}}
what is the significance of switching threshold in cmos?? how it affects the circuit?? please help..
You seem to have the sign reversed. Negative body voltage (on NMOS) relative to source increases reverse-bias and increases VT(eff).
Hello, I want to simulate SEU(Single Event Upset) effect in SRAM memory cell by SILVACO. In example which is given in silvaco is demonstrating SEU in a MOSFET with an external resistor and capacitor emulating a RAM cell. How can I simulate a SRAM memory cell which is consists of two back to back cmos inverter with transistor. It will be very
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 (...)
Does anyone knows how to design a biasing voltage reference circuit with enable/disable function in cmos? Normal stable biasing reference point are generated from a chain of equal size PMOS loads. How can we improved this with a enable/disable circuitary which is stable in process and temperature variations? :?:
What is the minimum LNA noise figure achieveable in cmos 0.18um.
I have to design a BPSK demodulator, and all I have are block diagrams. If anyone knows some links with more detalis on designing this in cmos, please let me know. ------------------- stefano2m
hello all, I must design a low jitter monolithic pll in cmos technology but I donot know how to start? please help me ..