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11 Threads found on Mirror Pole
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
dear every body could you pls tell me what is the physical meaning of the mirror pole and rezo ? many thanks in advance
By lagging the feedback FET, you will add peaking / sharpness to the rest of the mirror rack. This can of course be overdone.
SIR, im designing an OTA telescopic wid certain gain enchancement modification architecture wid current mirror technique .018 technology... i got my gain enchanced by 6 db bt my phase margin got very much decreased to 54 from 78.... what shud i do to bring pm to more than 60 ...i took currents as 200uA for the ota...suggest
can you tell me the differences between "the basic differential pair" and "the differential with active current mirror" ? i know the latter increases a "mirror pole", i.e., it has worse stability. what are the other advantages and disadvantages of the two circuits ? plz help me, thanks in advance. jeffrey
Hi, I am running a pole zero analysis via cadence spectre on a two stage opamp which consists of the classical diff pair with current mirror load and as second stage the classical common source/inverter problem is that i cannot see the RHP zero that is created via the feedforward path of the miller compensation capacitor...All t
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
This is the popular wilson mirror. This is negative feedback and can become unstable. Do a websearch to know more about it. i think shd be no problem because only have one inversion in the loop or one gain stage and one dominant pole.
These are my observations: 1. R1, C1 to compensate the zero due to mirror T3-T4. 2. C4 creates pole as in the paper. 3. C3 compensates the zero due to T2 (it is almost like a capacitor from gate of T2 to drain of T1). I am not sure about C5, and the role of T5 and T6 (some startup ?) Bupesh
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 (...)
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 (...)