Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic 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

design of microwave mixer with ADS

Status
Not open for further replies.

mahdiye

Newbie level 5
Joined
Dec 20, 2014
Messages
9
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
44
do you have any example of microwave mixer design with ADS?
I want to desgn a mixer in 3GHz and with
paralell coupled filter
schotcy diod
stepped impedanse filter
 

tony_lth

Advanced Member level 5
Joined
Jul 28, 2010
Messages
2,004
Helped
375
Reputation
752
Reaction score
367
Trophy points
1,363
Location
Beijing
Activity points
11,868
the filter should have examples.
diode should use ADS diode model and input your spec.
Why do you need a stepped impedance filter for 3GHz?
 

mahdiye

Newbie level 5
Joined
Dec 20, 2014
Messages
9
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
44
thanks dear tony
Is diod schotcy model in ADS?
it is my homework...and I force to use a stepped impedance filter for it...
 

Hawaslsh

Advanced Member level 4
Joined
Mar 13, 2015
Messages
102
Helped
5
Reputation
10
Reaction score
5
Trophy points
18
Location
Washington DC, USA
Activity points
1,279
Hello,

The ADS diode model will work for a Schottky contact. To my understanding the diode model will work for any diode which exhibits a non-linear I-V ~ I=Is e^(Vd/nVt). In the ADS schematic you will have to include the diode model parameters and fill in the appropriate values for a Schottky contact: Is, Rs, Cjo, Vj, ...etc.. Data sheets for existing Schottky diodes on the market could give you starting point for these values if you don't have a specific contact area, substrate, and doping level you must use.

Hope that helps,
Sami
 

mahdiye

Newbie level 5
Joined
Dec 20, 2014
Messages
9
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
44
Untitled.pngIS this model true?
I wanna to know what simulator is suitable for this design??!
Is HArmonic balance suitable?
 
Last edited:

Hawaslsh

Advanced Member level 4
Joined
Mar 13, 2015
Messages
102
Helped
5
Reputation
10
Reaction score
5
Trophy points
18
Location
Washington DC, USA
Activity points
1,279
Hello again,

Harmonic balance will work for non-linear analysis. You will have to label the node which you want to plot the spectrum of, in your case the node connected to your 50 ohm load.

Your circuit topology isn't quite set up to act as a mixer, I am assuming you wanted to create a frequency down converter. You will need a second source, the LO, to modulate the diode. There are many example topologies on line and within the Agilent/Keysight documentation.
 

mahdiye

Newbie level 5
Joined
Dec 20, 2014
Messages
9
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
44
hello
my design is similar this picture
refrence's pic is stephen mass bookmixer.png
 

volker@muehlhaus

Advanced Member level 5
Joined
Apr 11, 2014
Messages
2,509
Helped
982
Reputation
1,966
Reaction score
963
Trophy points
113
Activity points
14,874
No, this will not simulate correctly. Simulation is wrong if you use the wrong type of circuit models, or in your case ideal wires.

The reason is that this ring resonator needs coupling to the other lines, and model-based simulation includes that coupling only if you use models for coupled microstrip lines (MCLIN in the microstrip lines palette, where the "C" stand for coupled). If you use normal microstrip (MLIN) then each line is simulated independently, with no coupling to other lines. And you have used wires (ideal connections) which is even worse than MLIN because it is an ideal connection (no physical length). Use MLIN for the uncoupled lines and MCLIN for the coupled line, then check your resonator.

~~

As a new ADS user, this tutorial might also help you:
http://cp.literature.agilent.com/litweb/pdf/5991-1516EN.pdf
 
Last edited:
Status
Not open for further replies.
Toggle Sidebar

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top