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Dear all,
as a beginner, I want to ask What PDK (Process Desgin Kits) excactly includes?
include drc, lvs files from foundry? any other things?
Thanks a lot
Re: a basic question on gm
Okay,
I understand what small signal means in the equation.
But based on the above discussion, I cannot understand the following statement in Razavi's book.
I draw the figure as below:
in Razavi's book (P122), he wrote:
Since Id1 and Id2 stand for the small...
Re: a basic question on gm
Thanks a lot for your reply.
Can I understand your explanation in this way:
you said:
so does the small signal current Id1 mean a small variant current on the biasing current Id. We can wirte it as ΔId?
Say, if the biasing Vgs is 1V and the basing current is 1mA...
a basic question on gm
When I am reading Razavi's book "Design of Analog CMOS IC"
I saw:
Id1=gm1*Vgs1, I don't understand why.
Because, gm=µ*Cox*W/L*(Vgs-Vth)
and, Id=1/2*µ*Cox*W/L*(Vgs-Vth)²
Then, How could Id1=gm1*Vgs1? I am really confused. I know I must confused some fundmental...
I heard on said DFT could only see the distortion, SNR is related to noise analysis and should use something related to ac analysis. But I dont know how
Re: PLL Design
Hey amarnath,
I am interested in how to calculate p2p or rms jitter by the eye-diagram plot? Could you give us more details about it.
I am also working on the design of PLL, but wonder how to calculate the jitter.
Thanks in advance
Dear ambreesh,
Thanks for your post. Your disscusion make the question clearer and clearer. As I asked in the former post:
How would it work if Vx initiallly is higher than Vb-Vth2, say V1? In that state, M2 and M1 are all off, and the charge at the capacitor has no way to follow, so Vx will...
Dear ambreesh,
many thanks for your idea, but I still have a question.
In your post:
"You have a capacitor at node X and this gets charged"
You mean when the capacitor is charged to Vb-Vth2, then M2 is off and there is no current to charge the capacitor anymore, so Vx will approximately...
I can undersand why Vx cannot be smaller than Vb-Vth2. But I am not sure I can fully undersand why Vx cannot be greater than Vb-Vth2. The following is my undersanding. Could you please see if I am correct? Thank you in advance:
When Vx is greater than Vb-Vth2. M2 truns off and the sum...
The book says Vx≈Vb-Vth2. Since Vx≤Vb-Vth2
Then why Vx cannot equal to a value much smaller than Vb-Vth2, such as 0 or 0.1mV? Why should be approximatly Vb-Vth2?(i.e. why must be at the edge of "on"?)
Thanks
James
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