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Razavi, Design of Analog CMOS Integrated Circuits - Chapter 13, under DC Offsets, page 468, and it's regarding eq (13.69). Also, below is my original post. Thanks.
Would someone please explain why lowering tail current of a diff pair would improve its mismatch (page 468 Razavi) ?
In the...
Hi dick_freebird,
Thanks for your response. I think I understand what you are saying.
However, my question was much simpler and just in a general sense. Given the mismatch (delta Vt, delta beta), the book says to improve the offset (noise) of the input diff-pair, increase the gm. It also...
Would someone please explain why lowering tail current of a diff pair would improve its mismatch (page 468 Razavi) ?
In the same paragraph of the book, it goes on to say that to improve mismatch/noise of a diff-pair, one needs to increase gm. So it makes sense that increasing the W/L ratio...
It seems like there is a tutorial for "frequency compensation techniques using current buffers" by Garimella. Does anyone happen to have a copy ?
Thanks,
dbmd
Re: bode plot confusion
Other than the concept of phase margin, not really. I recall vaguely that it also talks about the correlation between closed-loop and open-loop unstable poles.
Re: bode plot confusion
The background for all of my questions is for me to understand frequency response and stability of a system. I'd like to be able to look at a circuit diagram and, similarly to visually identifying gain stages, be able to identify poles/zeros and estimate the frequency...
Re: bode plot confusion
LvW, by simulation, you mean some sort of open loop to get the mag and phase plots. And from them, estimate the pole and zero location ? But then you will need to tie these zeros/poles to the corresponding nodes of the circuit right. Can you do this by visual inspection...
Re: bode plot confusion
I will play with matlab to confirm your 2nd point.
Speaking of dominant pole/zero, without doing small-signall, with some effort one can probably associate a particular node a circuit (opamp) with a dominant pole. However, intuitively, how to tell whether that pole...
Re: bode plot confusion
I think I see what you are saying now. Bode uses the magnitude of the pole/zero as opposed to just the real or img part. So in the bode mag plot, there is no difference between having poles at -0.5+/-j20 and -20+/-j0.5 ? Intuitively, what will be the difference in...
Re: bode plot confusion
You kinda answered my 2nd question although I'd like to understand how the sign of the real pole affects the phase plot. And yes, I've used matlab to generate the plots.
Any insight to my 1st question regarding the complex pole, specifically in the tf of...
When doing a bode magnitude plot for a complex pole, do I use the real or img part of the pole ? Matlab seems to point to the img part (20), which is confusing since for the non-complex pole, the real part (1) is used.
tf=1/((s+1)*(s^2+s+400)
Also, there is no difference between right-half...
either the large RC method or ideal buffer method forces the the dc value of the input and output to be the same. is there a different way to set the dc op of the input and output independently ?
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