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.

How to tune the differential matching?

Status
Not open for further replies.

jerry117

Newbie level 1
Joined
May 26, 2003
Messages
0
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,282
Activity points
101
differential matching

I meet a problem how to tune the differential matching. This matching network is between the differential output of PA and differential input of Balun. Now, I know the input impedance of Balun is 50 ohm, but I don't know the output impedance of PA. In addition, I also have the reference design that includes this matching network and components values. After I measure the output power of this circuits. The power is smaller than vendor's expect. I guess two reasons. One is the layout. The other is differential mismatching. How should I slove this problem?
 

Mazz

Advanced Member level 2
Joined
Nov 3, 2001
Messages
676
Helped
131
Reputation
262
Reaction score
50
Trophy points
1,308
Activity points
5,463
differential matching network

If you have a reference design try to follow it as you can.
Some general alyout consideration are:
-compact the matching network
-use simmetry
-be aware of grounding of components. This is a very "hot" problem. The vendor of the balun usually gives some layout advices. Follow them carefully.
-use component with good Q.
Bye
Mazz
 

toonafishy

Full Member level 6
Joined
Jun 18, 2002
Messages
369
Helped
38
Reputation
76
Reaction score
12
Trophy points
1,298
Location
Earth
Activity points
3,178
matching network differential

You might try @gilent app note AN1373-7 (5988-2923EN.pdf) to start.
 

guamak_menanak

Full Member level 2
Joined
Apr 13, 2004
Messages
139
Helped
3
Reputation
6
Reaction score
3
Trophy points
1,298
Location
malaysia
Activity points
1,888
tune differential matching

I think it is better you attach the schematic of your diff amp here! It is simple to us to discuss more on your topic...

:lol:
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top