Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
Dear Albgg:
I took a mistake. The sensitivity before RX antenna is -30+3-50=-77dbm not -83dbm.
In my case our TIS measurement result is -85dBm, but antenna engineer told me
dut receiver is -77-5=-82 not -77+5=-72. it confused me...
Dear BigBoss,
Thanks for your feedback.
Please ignore modulation, BER,EVM.
Because I want to know should we need add or subtract RX antenna or ignore antenna gain.
Do you know which solution is correct?
Thanks...
Dear All:
I have a question about wifi sensitivity caliculation.
Our TIS sensitivity test result is -85dbm and I want to roughly caliculation by equation.
SG(Pt=-30dBm)---TXANT(Gt=3dB) ---- AIR(Ploss=-50dB)----RXANT(Gr=5dB) ----DUT(Pr)...
Dear All:
There is an IEC spec in IEC61169-2 document
" Reflection Factor 7% up to 2GHz when terminal at Zc=75 Ohm "
My question is
1. Is this reflection Factor mean Γ =0.07?? Or means power loss=7%??
2. How about return...
Dear all:
How about min distance between USB Wifi dongle and Main board in PCB design?
usb wifi is parallel above Main board.
I can't find this in web, someone told me 10mm, is it correct?
Thanks,
OK, I see.
"Linkbudget is for system design, to design every component specifications in a system."
Pmin is only one specification of a receiver that need meet our BER
But linkbudget total gain must large than Pmin, right?
Thanks.
tony_lth,
From your analysis,
LNA(25dB)+IF(70dB)=95dB gain --->linkbudget (for detect -90dBm signal)
Receiver(50dB)+demod(40dB)---> Pmin( to detect -90dBm signal)
It means when have demod function, the receiver only need 50dB gain and the rest gain is job of demod to operation.
but...
tony_lth,
In your case PTP system "sensitivity can be -90dBm,link budget power can be -40~-60dBm".
I think linkbudget total gain should be at least than 90dB to detect -90dBm signal, but you write
-40~-60dBm , can the receiver detect -90dBm signal...
Vfone, tony_lth
Thanks for your explanation I got it that increase gain 10dB won't improve Pmin 10dB.
As I mention, linkbudget will be improved 10dB from the formula calculation,
but I still confused why...
vfone,
from the Friis formula I think the Pmin won't improve 10dB if Gain increase 10dB.
But from general receiver linkbudget it should be improve 10dB in Pmin,right?
Pmin is that I concern.
Thanks.
Dear all:
I have a question qbout LNA gain question.
In receiver, if LNA gain increase 10dB, will the min sensitivity increase 10dB or not?
According Pmin=-174+BW+NF+SNR
nf=nf0+nf1/gain1+...
Pmin and NF will be improved but...
Dear all:
In DVB-S/S2, how to cal treansport stream clock?
ex: DVB-S QPSK SR=30M CR=7/8
&
DVB-S2 8PSK SR=20M CR=9/10
I has search web and can't find any information,please help me.
Thanks.
Dear all:
In DVB-S/S2, how to cal treansport stream clock?
ex: DVB-S QPSK SR=30M CR=7/8
&
DVB-S2 8PSK SR=20M CR=9/10
I has search web and can't find any information,please help me.
Thanks.
XTAL question..
Dear FvM,Erikl:
Ok,I see.This structure is possiable to reduce emissions from the XTAL and susceptibility to inter and power dissipation.
Thanks.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
