Continue to Site

Welcome to EDAboard.com

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.

Register Log in

How to simulate NFdsb & NFssb of a mixer using ADS ?

Status
Not open for further replies.
C

caikundi

Newbie level 4
Joined
Apr 1, 2012
Messages
6
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,312
Hi,boby
When i simulate the NFdsb & NFssb of a mixer using ADS,I get the result :NFssb=8.6 & NFdsb=7.2 . Is that correct?
 

Good question, it depends on your mixer topology and how you simulate your NF.

Further informations, like schematic, would be helpful.
 

I am so sorry to you,because I do it in my company,I can not put it on the Internet or forum.If you have any example of how to simulate the noise figure ,can you send it to my E-mail,thank you a lot.My E-mail addres is caikundi@sina.cn . I hope anyone can help me.
 

In ADS there are quite good examples of noise figure simulation of mixer ("Design Guide")!
 

johnjoe said:
In ADS there are quite good examples of noise figure simulation of mixer ("Design Guide")!
Click to expand...

I have seen it yesterday,thank you .But I think that the NFssb is equal to NFdsb+3dB,and the result in many examples do not match it,as well as my own result.It confuse me somedays.
 

As i remember it is NFssb=NFdsb-3db, from IEEE definition of SSB-Noise figure. They assume that there is no noise at the mirror frequency!
 

johnjoe said:
As i remember it is NFssb=NFdsb-3db, from IEEE definition of SSB-Noise figure. They assume that there is no noise at the mirror frequency!
Click to expand...

“Single SideBand Noise Figure is 3dB higher than a Double SideBand Noise Figure” .But hou to explain the result what is not 3dB higer ?
 

caikundi said:
“Single SideBand Noise Figure is 3dB higher than a Double SideBand Noise Figure” .But hou to explain the result what is not 3dB higer ?
Click to expand...

Yes in reality, but from IEEE the mirror frequency contributes no noise, it is noiseless! In ADS your definition is right! If there is a smaller difference than 3dB one explanation would be a different response of the mixer at the signal and mirror frequencies!
 
johnjoe said:
Yes in reality, but from IEEE the mirror frequency contributes no noise, it is noiseless! If there is a smaller difference than 3dB one explanation would be a different response of the mixer at the signal and mirror frequencies!
Click to expand...

Thank you very much.I think you are right.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top