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79 Threads found on Charge Injection
The voltage step effect is known as "charge injection" through gate capacitance and will be observed with any real analog switch. The effect is considerably lower for CMOS switches where NMOS and PMOS transistors are controlled by complementary gate voltages so that the injected charges cancel mostly. An additional positive voltage step (...)
How does those two affect the circuit? what kinds of effects we will see in circuit?
The size will fall out of optimization for whatever it is that you care about. We do not know what that is. Maybe you care about propagation delay, or not. Maybe you care about clock feedthrough or charge injection. Maybe you only care about minimum layout area. Transistors have properties, you fiddle them around until you understand, then unt
Its a semiconductor process failure mechanism the material is super heated in a plasma gas environment with charge injection. THere is one condition that results in a process failure that is counter-intuitive where the large area floating conductors discharge with less current injected rather than more. Hence "reverse" antenna effect. http:/
The observed charge injection is described as crosstalk between digital input and switch in the datasheet. Your circuit is generating maximal crosstalk because you bias the switch DC level near to ground instead of half supply. All crosstalk specification are referring to the advantageous symmetrical bias situation, so we can just say that crosstal
I read the book from Maloberti, which says that: "A charge injection into a low-impedance node will only cause a glitch whose duration depends on the value of the node impedance. However, a charge injection into a high impedance or capacitive node causes an offset that can be problematic, especially when the injected (...)
Please explain charge injection in switch
It is possible but it requires careful design to minimize the charge injection from the CMOS gates into the signal path.
you are using a voltage source with most likely a 1fs rise/fall time, then yes you get those very large glitches, this is clock feed though and charge injection of turning on and off your switches. Never had your switches being switched by a voltage source, put a real inverter in there so it will be driven with something realistic. Also never use
Hi,there! As we know and can be seen from the pic below, the bottom plate sample technique is widely used in S/H to reduce charge injection from sampling switch. The sampling instant is said to be determined by the CLK Φ1p which is opened in advance with respect to Φ1 in many literatures. Recently, however, an engineer told me that in fa
The overshoot of clamped output voltage is mainly caused by the delayed action of the OP slewing out of saturation. That's an intrinsic disadvantage of this cicruit, when operated with fast input signals. The FET clamp circuit suffers from the same problem and most likely additionally from charge injection, particularly when using a power FET like
i saw that sort of topology(switch between two current mirror). Should have been different somehow to work. There are various way to short Vgs, I don't see a particular preference. Spikes created by charge injection seems to be a problem anyway.
Please don't give me the 2 transistor analogy, I want to know the physicists viewpoint on this.... Sounds like, "I can't understand how a transistor works, now I want to understand SCR". That's helpless, because the charge carrier injection mechanism is effectively the same. After understanding it in case of a transistor, you should
hi all, I want to change the charge injection parameter "xpart" in the cadence 5.14..Can somebody tell me how to do it & where do i find the BSIM file in cadence to change the xpart from 0.5 to1??..Kindly help me
You can find good schematics in older databooks from Harris Semiconductor, Intersil (back when the two were distinct), Data General, even RCA CD4000 logic. You need a demux and a rack of switches. But then come the niceties like break-before-make (so as not to cross-contaminate sample voltages), charge injection (ditto), tradeoffs in on resistance
maxim also has 16 channels decoder via spi ... MAX14802, MAX14803, MAX14803A Low-charge-injection, 16-Channel, High-Voltage Analog Switches - Overview
Hi, Can any body let me know how to do charge injection efficiency simulation of Pixel ? Please, share with me your information Thank You.
Hi, how to suppress charge injection effect in sample hold circuit ?
charge-incjection can be change to a constant offset for proper structure and timing.
If you can afford it, route clk & clk_b in parallel. So the influence on crossing sensitive signal lines (charge injection during clock edges) can be compensated (not totally, but to a good part). And you always have both phases available ;-) .
I see you have the buffer in the circuit. So you don't need to worry for big glitch. If smaller glitch is required in your application, you can take care of channel charge injection and clock feedthrough.
Hi, all, I'd like to reduce the channel charge injection of the transmission gate, I know that this effect could be reduced by selecting the right size of NMOS and PMOS carefully, but this is only for a specific input voltage. When the input voltage changes, the channel charge injection still suffers the output, so could (...)
Guard rings are used to prevent injection of charge carriers from the substrate to active devices through latchup. Since latch up requires two cross-coupled BJTs (i.e. creating a parasitic thyristor), the idea of the guard rings is to provide an alternative collector or emitter for the parasitic devices to latch up to. Since there are two parasitic
I assume you use non-overlapping clocks to minimize input dependent charge injection?
Hi All, Due to the charge injection and clock feedthrough, the switch will generate very large current glitch during the low to high or high to low transition of the switch for the current steering DAC. For example, the current source is 32uA, but the switch will generate about 300uA current glitch during the transition of the switch. How much t
Just use an analogue switch or small MOSFET across the capacitor. You want the most pathetic analogue switch you can find because it will inject charge into the capacitor. Low resistance analogue switches will have bigger transistors and hence more charge injection. If you go to Analog Devices web site & look for analog switches and use (...)
Hello!! I'm desiging sample and hold with buffer amp(single ended). I know there are big 3 issues in S/H. 1.charge injection 2.clock feedthrough 3.offset V at OPAMP most of paper say how to cancel feedthrough and charge injection. They don't say opamp offset voltage. How to compensate 1,2,3 sametime? could (...)
hi, I design a bootstrapped switch used in a simple sample/hold circuit( a bootstrapped switch with a cap load). The bootstrapped circuit and simulation result is in the following graph. In the simulation, the blue line is a ideal switch result. the red line is using a bootstrapped switch. It looks that the charge injection is so large
The output is not always at ground because your input is moving. The transmission gate's output is always trying to follow the input voltage. Vin =0.5 V, given long enough time, Vout = 0.5. This is why its not 0. It goes over Vdd because of the charge injection mismatch when you are turning off the tranmission gate. charge (...)
I design a kind of dac and I find that due to charge injection of switch to the resistor string , the output of dac have glitch about 10mv-20mv even more .I did not know how to solve this problem,who can help me . thanks
Hello, anyone knows how accurate is the charge injection model in BSIM3? also how can i disable this effect from the model? regards, Safwat
By any means that reduces charge injection in analog switches.
you can simply use a t-gate as switch sampler for a sampling cap. :) however, you have to choose correct sizing for its transistors (to minimize clock feed-through, charge injection, and any harmful effects); a true clock must be defined, preferably a non-overlapping one with real rise/fall times (I suggest you using of real clock generation). I
Hello Friends.. How to decrease charge injection Error in Switches...... We basically know that we can reduce using dummy transistors... Is there any efficient way to still reduce the effect... awaiting for your Reply's Thanks & Best Regards Shady205
Hi, Let me describe my problem: 2 basic sample and hold stages ( driver-switch-sample cap ) are cascaded. The first sample and hold cap is sampled first and the switch to the other sample and hold at that time is open ( not conducting ). After that the switch of the first sample and hold is openend ( some charge injection canbe observed ).
Hello, can any one provide any publication about the effect of the feedback switch in the SC amplifier. i mean the ON resistance , Off resistance , thermal noise and charge injection regards, Safwat
If your capacitor is a passive one, this could be a charge injection case. Use bottom sampling and fully differential architecture to reduce it. BTW, MOS model parameter will also affect the charge injection simulation, but it's only simulation case.
I want to know how to design a good switch in AD/DA circuits? Since we know it has clock feedthrough and charge injection effect in switch.
also noise (but i don't think you put it into your simulation), ron of switches, clock feedthrough or charge injection, lousy cm-feedback of the opamp. Also saturation of the opamp, limited gbw, sr, finite gain, ...
bottom plate sampling is a technique used to prevent signal dependent charge injection and introduce instead a common mode offset which is removed if working in a differential manner please refer to any ADC course
Any reference for invoiding the charge injection. Use the MOS Pair or only use NOMS W/L?
Hello everybody, I want to design sample and hold circuit using double sampling technique at 160MHz clock (320MS/s) and 70dB IMD. Here I choose the two-stage opamp, the schematics are here. (Two stage module and the double sampling). But slew rate and charge injection decrease the IMD sharply. I try to adjust the miller capacitance, but the effe
This normally depends on the level of SPICE you use. It should take into consideration charge injection .....
Hi guys, i am plotting the current at the output of charge pump of PLL due to charging and discharging of Ip into the loop filter. I see some spikes and over shoots due to charge injection. I am not sure how to make a comment on the magnitude of injection. I would really appreciate if someone gives me some feedback. (...)
Well, it also impacts charge injection (if the clock is very slow).
cap ofcourse will cause charge injection. but it can be solved by other techs. you should consider cap's noise kT/C. large cap leads to low noise.
Can you write mathematical expression for the node charge?
i'm a freshman in the Analog. i've some trouble while reading the 4.1 MOS Switch from P.E.ALLEN's book. Page119,i can't understand the charge jection and its two case.Why CL is not charged in slow case but in fast case?What's the difference between clock feedthrough and charge injection? Can we study the book together?:!:
C. Eichenburger, W. Guggenbuhl, ?On charge injection in analog MOS switches and dummy switch compensation techniques,? IEEE Trans. on Circuits & Systems, vol. 37, no. 2, Feb. 1990, p. 256-264. Added after 18 minutes: C. Eichenberger, W. Guggenbuhl, ?charge injection of analogue CMOS switches,? IEE Proc. G:
Like what raduga_in mentioned, the Cgs/Cgd can introduce the clk feedthrough, that's why if you decrease the L, Cgs/Cgd decrease correspondingly. So dummy transistor can absorb part of the charge injection and down play the clk feedthrough if my understanding is correct.

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