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dear every body could you pls tell me what is the physical meaning of the mirror pole and rezo ? many thanks in advance
like the figure, the solution is a pair of conjugate pole and zero. but I think it should be a mirror pole and an output pole. why ? And when I plot the frequence response (bode plot) , the position of pole is only the real part of it ,or the amplitude of complex number. Thanks
Active current mirror is used for increase the output resistance. So it will have higher gain. Also it will lead to lower frequency pole according to bigger output resistance. pole frequency is related to R.C. Here R is the equivalent resistance, and C is the total capacitance at the node.
I'd say that the poles can be divided into two groups: -poles in the opamp: Miller pole and mirror pole (that should be the non-dominant one) -poles of the LDO: there are those cause by the opamp, the loading of the pass device on the opamp will create another pole, and (...)
note that what u need to compensate is the CMFB loop not the CMFB amplifier and as u say by increasing the load capacitance u push the dominant pole to roll-off earlier and the dominant pole of the differential amplifier is at the same time the dominant pole of the CMFB loop(assuming that the mirror pole (...)
... but this one is more complicated than razavi Sure. But you're supposed to understand the given method and be able to extend it to a more complicated circuit. Hints: Razavi's examples Fig. 4.33 , 4.34 & equ. (4.53) as well as Fig. 9.21 , 9.22 & equ. (9.13) come quite close to your pb. Don't forget the gain enhancement
i have designed a low power beta multiplier refernce (70nA) as shown. The opamp is a 5T diff check for stabilit i broke the -ve feedback loop and plugged iprobe from analoglib in cadence. stb analysis shows phase margin of 20 deg and gain margin of 14dB with C=2pf. I m not able to achive better phase margin even after shifting the mirror po
It can be generated by current mirror in differential amplifier... also in the case of pole-zero cancellation, when components are not perfectly matched. The effect of pole-zero doublet could be not clearly seen in the amplitude and phase response, especiaqlly if the case if they are closed together, but relativlly small mismatch can have (...)
The purpose of my suggestion was for you mainly to test the normal current mirror operation in your simulator. Have you tested it?? I agree with cellphone, that is also what I guessed: the diff. transistor pair do not get correct DC bias from V3! To check this, omit V3 and bias base 5 and base 6 via two separate resistors from V1, ok?
The gain of the current mirror OTA is low.This is the biggest disadvantage.
you have 3 poles and one zero. The dominant pole is at the output - the only high impedance point in the circuit. The other pole is associated with the NMOS current mirrors and the third one with the PMOS current mirrors. The zero comes from the fact that the signal sees unequal paths to the input. One path (...)
By lagging the feedback FET, you will add peaking / sharpness to the rest of the mirror rack. This can of course be overdone.
Hello Analog guys I designed a current mirror OTA with a partial positive feedback, the circuit is like the one I attached from Gregorian book, Figure Nr. 3.41. After I finished the design , I have simulated the circuit with and without the positive feedback as shown in the first and second image respectively. Here I have a couple of ques
Hi 2K, Normally you can´t go below the regulators reference voltage.....but. If you use the same Vref. to create a negative mirror voltage you can now use this as your ground or minus output. This is the idea. /Otto.
Urgent!!! Please Show me the link to download DEMO CD of mirror Suite Software. Thanks.
In my new design I have to use current mirrors. I have one current with hundreds of nA, and I have to mirror it in 1:1, 1:10, 1:100 and 1:1000 ratios. Of course thermal compensated. I know it is simple with IC design - a few transistors, resistors, cascode etc., but I am looking for any IC or another solution I could use on my PCB. regards Kam
Layout is the most likely cause. Also take into account transistor sizes. Remember that all "deltas" are divided by sqrt(W.L) So, to reduce the standard deviation of each component (Id and Vt) you must increase transistors sizes. Another point in which ALL TRADITIONAL BOOKS make a mistake is about the term (Vg-Vt) that divides delta Vt. Actuall
Can you guys help me with a design for a J-pole dual band antenna ( vhf & uhf ) that at leaqst can handle 250 watts input power. :o
I am designing a regulator. which uses a close-loop opamp and a bandgap to get double or high output voltage. But in my design, since output has accurate require, so the opamp open-lop gain must be enough high. So I use fold cascode (first stage) + PMOS+two resistors (second stage). But the main pole in the first stage output, so when i increase th
Hi I am looking for a CMOS single-pole double-throw switch which could switch differential signals. The working frequency better to be up to 2GHz. Is there any available topology for that?
Dear all, I am doing a research on the Opamp pole/zero design, would somebody provide me some info abouth this topic? Paper or thesis ... All are welcome! Thanks a lot! :P
Iss there any circuit simulator how can simulate poles and zeros of a circuit and give their values???
hi all, I want to devlope an application in vb for Telephonic pole. How it is possible to connect a vb software to your dailup modem that if some one diall the number of your modem then the vb sofware response the caller a predefined voice message and ask to input pole number. If some one have ideas how to implement this then please share..Also t
How can I determine the dominant pole of an opamp by hand calculation? I am confused with associating each node with a time constant and things like that......where can I find good reference about that? I read Razavi's simply does all the calculation and I don't really get any insight of the circuits......any idea? Thanks a lot. :D
on my avatar i show a self biased current mirror, i had been studing this circuit, but i have still one question, how, exactly, does it comes on estability.
Hi.. any one know any technique which can be used to design a current mirror capable of providing 10mA with low voltage headroom (less than 0.3V for the transistor to operate, the signal swing takes about 2.7V with 3V power supply) and high output impedance (more than 5k)? Is it possible cascode current mirror can achieve such a low voltage headroo
Hi! Any one have any articles, journal or ebook regarding current mode method for current mirror? If u have something regarding active feedback/ adaptive method on current mirror is warmly welcome too. Thx :o
Is it possible to have the wideswing current mirror for bandgap circuit. Does this work properly in silicon. Where do I need to have the start ups. (please see the attachment for circuit) thanks in advance.
Here are few question Gain, (how to improve gain?) Bandwidth, (how to improve bandwidth?) Feedback,(Stability is a must ask question! Know pole, zero, gain and phase margin!) Slew rate,(How to improve slew rate?) Offset,(how to eliminate offset? Chopper stabilized circuits, autozero) Noise,(what is thermal, flick, shot noise? What are
Need the next MTT paper: J. D. Rhodes and R. J. Cameron, ?General extracted pole synthesis technique with applications to low-loss TE011 mode filters,? IEEE Trans. Microwave Theory Tech., vol. MTT-28, pp. 1018?1028, 1980. If anyone has it, please upload. THANKS!
In analog Macro model, we can use the construction of resistence, capacitor, inductor to modeling the pole or zero. Who can describe some detail for it ? Thanks!
Who can tell about mirror Bit flash memory of AMD? I am a memory designer, and want to exchange some experience. thanks!
Hi I have designed a 4-pole gaussian BPF arround 455kHz with 10kHz 3dB BW. I have tested it response and found that the sharpness is good but the insertion loss is about 30dB. I guessed this insertion loss was due self resonance of the 680nF capacitor, but i have tested it response and found the resonance frequency is equal to 3.5MHz. What is
After finished a DAC design, I found that the bandgap output voltage can not bias DAC directly. So I need a current mirror circuit to bias the current source array in DAC (current steering architecture) . This circuit can change the bandgap output voltage to current. A paper tell me this kind of bias method is more steady than voltage bias. But,
have the ADS software support pole-Zero and transfer function simulation .......
Hi there, i've failed to bias wide-swing cascode current mirror properly using 1.8V supply. The circuit i used is Fig 6.11 from Ken Martin book. Is it impossible to bias 4 transistors in cascode because of 4xVdsat? I need high current so that i can reach high slew rate. Can anyone help me or give me suggestion? Thanks in advance!
most effective is to mirror the power pmos while not connecting the drain together. arsenal what is the meaning, may you explain in detail, thanks!
Hi, Does anybody have the experience using totem-pole output stage in RF design? Is it specify for digital circuit? Regards,
Hello all, I noticed that when we evaluate a digital filter, we always focus on the Zero/pole Diagram, but how to read such a diagram from a view of engineering? The problem is, if I have a lot of digital filters to choose, can I choose one with the "BEST" Zero/pole Diagram, but how to determine it is the best from the diagram? Is it poss
You can check the formulas but here is some intuitive explanation. Let's call the transistor on the bottom of the cascode transistor 1 and that on the top - transistor 2. If you have a simple current mirror (one transistor only) - both in cmos and bjt - the voltage at the output terminal of the mirror (drain or collector) can vary depending on the
Try to use cascode structure. Since the effect of early voltage is reflect by the finite output resistance of current mirror, using cascode can boost your output resistance and thus equivalently reduce the effect of early voltage.
I think there must be a error for the mirrored current for the current mirror. In the BIpolar or Mos process, the relative error of mirror is improved by increasing the ouput resistance .
This is self biased current mirror configuration . R=1.8-(3Vov+3Vt)/I ; Vov=overdrive =50mV R approx is 60 ohms ,calculate W/l for pmos and nmos . The bias current has resistor variations that needs to be accomodated in design .
low input offset and also low offset drift. The stability issue, since the paristic capacitance from PMOS current mirror is going to locate a new position of your pole.(especially for two stage opamp with miller compensation)
Thank you all for the replies! Dear Alles Gute, What is this miller effect of Cgs5 you talk about. I have never observed it. Next, I hope u have smaller lengths for PMOS connected to supply so the would have lower parasitic capacitance. I suggest lower lengthe as their Vds would be small which is dependent on your bias volt
dear all: what's gaussian and single-pole exponential decay pulses? which differences are there between them?
It is not desirable to have low output impedance. because the gain of AMp is reduced. the main reason that current mirrors are used is that we had a single ended amplifier which has high Gm.
You should not let M2 level saturation any time, or the shielding property of cascode current mirror will be vanished. That is, the current is variated siginificantly with the output voltage, some nonlinearity will occur.
if you just want to see how the mirrored version looks like, just go to print, and set it there. i believe its in the preference. you can choose which layer to appear and which layer on the top.
Hi All: I am designing a low power OTA, in which a local CMFB technique is used to improve the GBW and SR without increasing power too much. The circuit is shown in the attachment. GBW, and SR has been met by the introducing of two resistors at the top, but these two resitors also increase the second pole of this circuit, as a result th