11 Threads found on edaboard.com: 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
Analog IC Design and Layout :: 02-04-2013 14:01 :: Junus2012 :: Replies: 21 :: Views: 1138
dear every body
could you pls tell me what is the physical meaning of the mirror pole and rezo ?
many thanks in advance
Analog Circuit Design :: 06-29-2012 06:49 :: dinosaur078 :: Replies: 0 :: Views: 713
By lagging the feedback FET, you will add peaking / sharpness
to the rest of the mirror rack. This can of course be overdone.
Analog Circuit Design :: 06-10-2013 11:38 :: dick_freebird :: Replies: 3 :: Views: 753
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
Analog Circuit Design :: 06-26-2011 08:01 :: satyanitt :: Replies: 4 :: Views: 1203
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.
Analog IC Design and Layout :: 01-30-2011 04:25 :: leo_o2 :: Replies: 9 :: Views: 2373
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
Analog IC Design and Layout :: 05-26-2010 11:33 :: jimito13 :: Replies: 0 :: Views: 1414
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.
Analog IC Design and Layout :: 12-15-2009 21:30 :: wangkes9 :: Replies: 0 :: Views: 729
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.
Analog Circuit Design :: 11-23-2008 23:48 :: surianova :: Replies: 4 :: Views: 830
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 ?)
Analog Circuit Design :: 06-12-2007 12:33 :: panditabupesh :: Replies: 6 :: Views: 1867
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 (...)
Analog IC Design and Layout :: 12-13-2006 11:08 :: jonashat :: Replies: 6 :: Views: 971
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 (...)
Analog Circuit Design :: 06-22-2006 14:22 :: pixel :: Replies: 12 :: Views: 9621