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 improve a LNA's 1dB Compression point?

Status
Not open for further replies.
W

wizardyhnr

Junior Member level 3
Joined
Aug 22, 2004
Messages
31
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,286
Activity points
292
Recently I am design a LNA of three stages with a SiGe BiCMOS process. I want a output 1dB compression point of 10dBm or higher for the third stage of the LNA. I have set the collect current Ic 12mA, yet I have gain a 1dB compression point of 8.5dBm, which is lower than the figure of merit.
Do someone have any advice on how to improve the 1dB compression point of this LNA?
 

**broken link removed**
 

I don't know if this is feasible for you but, on the last stage you can send the
Input signal thru a Hybrid coupler (90°) and put 2 Output stages in parallel.
This will make the -1dB point ~ 3dB higher. Note one of the O/P stages will
be terminated to 50 Ohms and so will the unused Input of the Coupler!


And one other thing you might look at:

See if Stage 1 or Stage 2 is in compression, before the O/P Stage is!
Your -1dB point might be due to stage 1 or stage 2 and not the Output.

Cheers
 

thanks, I have checked that the first and second stage was not compressed. Using a coupler may be a little complex. I will try
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top