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Hi godfreyl! what do you mean by your first statement? hope you can explain it to me further, i'm not very knowledgable in analog designs... also, how can i improve my open-loop PSRR?
Hi!
Im using nmos input in my differential pair. So by cascoding my differential pair and increasing the length of my transistors would help me achieve a 60dB PSRR @ 1MHz?
In my current design i only have 25MHz GBW and 71dB open loop gain. What to do to further increase my gain and GBW?
What...
Hi! I'm designing a two-stage op-amp and aiming for a 60dB PSRR at 1MHz. Im using simple differential pair for the 1st stage and cascoded common-source at the 2nd stage, and i'm only getting <20dB at 1MHz. What can I do to achieve the 60dB at 1MHZ? Should i change my architecture? But im only...
Hi! Can anyone help me on how to use PycellStudio in Synopsys Layout Editor? Everytime I instantiate a PMOS or NMOS transistor it always appear as a rectangular box. I dont see the poly, nwell or even the metal layer. How can I see the layout view? Pls help. Thanks!
Meaning it is also safe to use Baseband model (TT, SS, FF, SF, FS) for 26MHz application... If so, then I might not anymore consider RF model in my design. Though its more accurate in terms of parasitic and noise considerations, however it is more complicated to use, its because i have not used...
Hi!..Im a newbie in analog design. Right now im designing an opamp in 0.18um technology to be used in a microcontroller operating in 26MHz. Which model should i use in my simulation? Because in TSMC 0.18um spice model they have RF model and baseband model. Which should I use between the two...
Hi! I'm doing a 0.18um technology in a pure analog design (opamp) which will be used in a micro-controller operating at 25MHz. I already have a model/tech file from TSMC. But I'm quite confused, what model should i use to properly simulate my design? Should I use RF models or baseband models...
Thanks Pancho-hideboo, now I understand why my PM=-180 deg... I dont have any other tool besides from Avanwave. Isn't it accurate? What type of plotting tool or design tool can you suggest which is more accurate than what I'm currently using.
Thanks LvW for the explanation. I'll bear that in...
Hi Pancho_Hideboo! What do you mean by wrapped phase? How should I unwrapped the plot?How come my PM at 3.12MHz is -180 (=+180-360) Please explain further. Thanks... Hi LvW! I'm still confused. How come my PM=0 deg and Pancho_Hideboo is saying that its -180 deg? I though i should look at it at...
I'm quite confused on how to measure phase margin in HSPICE (please see attached file). My unity gain frequency is 3.12MHz. The corresponding phase at f=3.12MHz is 157 degrees. So what is my PM then? Is it 180-157=23? or 180+157=337? I'm confused..In any case, is it bad or good? Pls help. Thanks!
I made an ac simulation in HSPICE of my opamp design and the result is 80db and it is vertically going downward at freq=0 hertz (see attached image). What could be wrong in my design? Pls help! Thanks.
I was able to compute for W/L based on Gm with the use also of tox,uo and vtho parameters from my model.
My netlist below is configured as open loop without feedback. Do i have to employ a feedback to be able to run an ac simulation?...Is my vp and vm configurations correct to run an ac...
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