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I've looked at the simulation for 100s now and yes, the voltages settle. unfortunately, all my transistors seem to be turned off after that time. I dont know why but my output signal still seems to be totally alright... i assume i cannot just ignore the problem, can i? I also put my AC amplitude...
Hey, I'm having a totally odd problem:
If you take a look at the picture, you can see how the drain-source potential of my tail current source transistor rises. My AC input signal has an amplitude of 10 mV (if I go even higher, the potential rises even more). I don't have a clue what could cause...
Hi guys, I just tried to calculate the input and output common mode range of 2 architectures… unfortunately, most of the results are totally unrealistic and I cannot find my mistakes. Hope you guys see more than me. Btw, the numbering of the transistors goes from bottom to top like: M0, M12...
Hi, thank you for your reply =) so what you say is, my CMRR for let's say 1 Hz would be 40 (which is my closed loop gain of the amplifier) - (-194 dB) = 234 dB without mismatch at first? Do I have to take the closed-loop or open loop gain for calculating the CMRR? Then I changed the dimensions...
Hi guys,
I am trying to simulate the CMRR of a fully differential telescopic amplifier. After having read quite a bit in the forum here I have come to a solution but I'm very unsure if I am really looking at the CMRR so I wanted someone who knows more than me to confirm it (see screenshots)...
Actually, now I get what you mean and I have asked myself as well, why I would calculate the input referred noise as rms value... but some papers do that and my tutor wants me to reach a certain value as specification and he is quite experienced. I'm sure he knows what he does... I know this is...
@ crutschow: the rolloff frequency is at 15kHz (actually it's tunable). The system has a second pole somewhere in the Mhz range. So how does this help? Unfortunately I don't see how to reasonably choose the upper integration Limit (is it 1 or 2 or 10 times the rolloff frequency?)
@FvM: I want...
Hi guys,
just a short question: I have a bandpass with a lower cutoff frequency at about 1 Hz and a high cutoff frequency at 15kHz. When simulating the input reffered noise, I integrate from 0.01 to 20kHz but somehow I'm not sure whether those limits are justified. I could theoretically...
Hey guys,
I've got a few questions concerning the following schematic.
1. Most importantly... how can I calculate that transfer function? I'll just never get the same result as they do in the paper...
2. Does anyone know what kind of feedback that is? What does it do?
3. Why is the formula for...
Hi guys, I have a question (again) but it's a short one this time:
if I have a bandwidth of 50kHz, a gain of 50dB --> GBW = 50dB(=316)*50k = 15.8MHz
I want to calculate the input referred noise (thermal) V = 8kT/3*(2/gm1), then I square it, integrate it and here is my question: do i have to...
Hi guys,
can any1 of you explain how to use gm/id charts (it took me like 3 days to even get them and now I can't use them.... it's kinda sad :-()? I've been looking for easy explanations but haven't found them.
If I want to build an OTA like shown in the picture with the following specs: open...
Thank you for your answer but even though it's not shown in the schematic I have a DC offset for V1 of 900mV. So that should not be the problem... Just don't get what's wrong there... <__<
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