Ata_sa16
Full Member level 6
- Joined
- Mar 29, 2016
- Messages
- 343
- Helped
- 59
- Reputation
- 118
- Reaction score
- 58
- Trophy points
- 28
- Location
- Milky Way Galaxy, 179° 56′ 39.4″
- Activity points
- 2,221
Wrong.generally the noise figure of differential LNA is lower than single ended.
If you use "analogLib/ideal_balun" in Cadence dfII, it is noiseless.Do u think baluns add noise to circuit?
Can you understand NF correctly ?but if you calculate the noise figure for diff LNA you can see its is divided by 2 !
I don't think so.But the thing is in calculation we ignore noise of iductors since we assume high Q.
Probably here number of Ls are dubled so noise is increased?
Show me noise contribution.You think 2.7 is reasonable ?
I cannot decrease more than that !
Consider transistor numbers required for diferential LNA and single-ended LNA.
Diiferential LNA requires many transistors than single-ended LNA.
This is a reason why NF of differential LNA is always larger than single-ended LNA.
NF of half circuit alone is lesser than NF of full circuit in your case.
.
Show me noise contribution.
Or try to disabel noise of any instance by the following method if you use Cadence Spectre.
https://www.edaboard.com/threads/353014/#3
Set "noiseon_inst[...]" or "noiseoff_inst=[...]" in options statements.
Surely read text book.Yes it seems like that at the beginning.
But you are wrong !
If you calculate the noise figure of single and differential LNA you can observe that.
It is also available in text book.
Your case has no relation to Autonomous-HB-PSS/Pnoise.I know PSS/Pnoise simulation.
But what is Autonomous-HB-PSS/Pnoise ?!!
PSS Analysis for Autonomous circuit.Can u explain a bit more ?
Show me noise contribution results.As I mentioned before, in calculating NF we do not include loss of inductors. but since here we use on-chip inductors, they suffer from low IQ and consequently high noise.
So I am sure that the NF is high because of this, not the topology itself.
See Example-5.25.Take a look at Behzad Razavi RF microelectronics CH.5 P.318
PSS has no relation to noise contribution.I did pss simulation ?
but I cannot find anything about noise ?!
See Example-5.25.
That is for CG LNA I am simuation CS LNA.
.
Show me noise contribution.
Or try to disabel noise of any instance by the following method if you use Cadence Spectre.
.
Wrong.That is for CG LNA I am doing simuating for CS LNA.
https://www.edaboard.com/threads/219613/#7In CG Nf is larger but in CS is lesser than single ended version.
Noise contribution is available as post processing.How can I do this ???
Wrong.
This is a general amplifier not CG LNA.
Wrong.
This is a general amplifier not CG LNA.
Surely read chapter-5 throughly.
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?