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.

Distributed Amplifier Design

Status
Not open for further replies.

93413245

Newbie level 4
Joined
Apr 26, 2015
Messages
6
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
35
Hi everyone!
I'm trying to design the most basic configuration of distributed amplifier
da.PNG

I have simulated it in ADS and the problem is that it does not amplify and gives me a negative gain over the frequency range 1G to 20GHz. This is my Schematic
add.PNG

Could anyone help me with that please?

Thanks in advance
 

BigBoss

Advanced Member level 5
Joined
Nov 17, 2001
Messages
5,117
Helped
1,529
Reputation
3,056
Reaction score
1,376
Trophy points
1,393
Location
Turkey
Activity points
30,772
If you use small signal s-parameter model of the transistors, it will give you a Gain.
You used non-linear models that need bias circuit.
 

SunnySkyguy

Advanced Member level 5
Joined
Sep 26, 2007
Messages
6,997
Helped
1,709
Reputation
3,416
Reaction score
1,700
Trophy points
1,413
Location
Richmond Hill, ON, Canada
Activity points
51,594
How did you calculate gain and model the transmission lines?
Did you choose a MESFET from the library?

Av = ½ n·gm·Zo, where n is the number of stages.
 

93413245

Newbie level 4
Joined
Apr 26, 2015
Messages
6
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
35
How did you calculate gain and model the transmission lines?
Did you choose a MESFET from the library?

Av = ½ n·gm·Zo, where n is the number of stages.

No I chose a FET from linear models, and I calculated gain from G = gm*N^2 *Zg^2*Zd^2/4 as mentioned in David Pozar's book.
 

93413245

Newbie level 4
Joined
Apr 26, 2015
Messages
6
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
35
I have used a FET from the linear models. Does it still need a power supply?
 

93413245

Newbie level 4
Joined
Apr 26, 2015
Messages
6
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
35
If you use small signal s-parameter model of the transistors, it will give you a Gain.
You used non-linear models that need bias circuit.

I have used FET from linear models. Does it still need a bias circuit?
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top