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No, as the formula shows, The SNR of the I/Q frontend is twice what we measure at a single I or Q output. So the nf halves. Please take a look at the reference I mentioned and tell me what do you think.
No image filter yet. Let me tell you what I want to do. I have a circuit like I attached(it...
Thanks for your beautiful replies :)
there are 2 clear answers to the subject. one is to do a BER test and the other suggests using splitter/combiner. both of them are for simulation.
I don't need an accurate calculation of noise in my circuit. I just want to formulate noise sources and NF to...
Hi everyone
I'm deriving the NF of a quadrature RF front-end. We all know how to calculate the input-referred noise in a single path receiver chain. Because it has one input and one output. But what about a quadrature front-end?
I just found this thread but there wasn't a good answer to it...
I studied that Interpolation filters are deployed to oversample the input data toin order to shape the noise(High pass the noise), remove some order of Fs replicas, and ease the reconstruction filter design(So we don't have to design a fast slop at fc).
But there still are people who do not...
Hello all,
I'm designing a 16bit Audio Delta-Sigma DAC using 180nm technology. The purpose is to learn how to make a delta-sigma DAC at the first try while high performance is not a concern. therefore I chose 44.1KHz as the input sample rate without using oversampling. I have the bitstream now...
I assume that you mean gm derivated from the simple Id=0.5uCox(W/L)Vov^2 by the conventional method. well, it was good since short channel mosfets were not around. Short channel MOS showed some other effects that conventional method couldn't be true anymore and formulating all these second-order...
Yes I'm designing the LNA and other blocks myself, that's what I should do. now I realized that I only need S-parameters for S11 of LNA. The confusion was because S21 is expressed as gain in everywhere, then when I simulated in AC analyze gain was something else! So I got stuck between microwave...
Thank you all for your replies "pancho_hideboo" and "volker@muehlhaus"
I've read these topics and many other things on the issue but got more confused and because of time constraints, I can't really go deep into it! So let me say what exactly I want to do and know:
I have an LNA with LC load...
Hi all,
I simulated a source degenerated LNA in ADS and I got S21=7(not in dB for now). Now as far as my knowledge S21 is giving the power gain. If I try to extract voltage gain from PG:
Ri=50ohm, Ro=1.3Kohm(the calculated impedance of the LC tank at fc)
Does it mean that the LNA multiplies the...
ADS documents are huge, and it takes time to read them!
I don't have access to GoldenGate simulator so its just ADS :(
Anyway, Thank you for your help and support, I'm doing my thesis so I'll be around for a while :)
This was the problem, I defined LO frequency as first in HB palette and everything is right now.
Thank you "pancho_hideboo".
and now for the first question, I would be appreciated if you explain it or give me a reference.
my standard is IEEE802.15.4 with 0dB rejection for adjacent channel and 30dB rejection for alternate channel. But I don't follow how these are related and why exactly!
here is all info:
Harmonic Balance input frequencies:
Freq[1]=2441 MHz (upper fundamental)
Freq[2]=2439 MHz (Lower...
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