I've tried to place the LEMtch block and do tools==>impedance matching,
but I find that this element can only optimize one specific frequency. What is more, I want dB(S(1,1)) to be under -20dB, but I have no idea where to specify this requirement.
I brand new with ADS. Am I using the right block?
Would you please explain it in detail?
Thank you very much!
eee100 said:
You can use matching smart component in ads to design a matching network.
Click impedance matching from the dropdown menu that is on the top left.Then place Bandpass Lumped Element Impedance Matching smart component.Then click tools>impedance matching. On matching asistant tab define your frequency range and terminations etc..
Thank you for your detailed explanation. I've followed your instructions, but the goal cannot be reached.
My setting is as follows:
order : 5 Fp1:1.5GHz
gain change:20dB Fp2:2.5GHz
synthesis Technique: analytic
The the simulation result is in the attachment, could you tell me where my setting is wrong?
Thank you.
alpuslu said:
Click impedance matching from the dropdown menu that is on the top left.Then place Bandpass Lumped Element Impedance Matching smart component.Then click tools>impedance matching. On matching asistant tab define your frequency range and terminations etc..
The schematic looks as the plot in the attachment:
A impedance matching network is required for matching the output impedance.
The output impedance is a series RL, in which R=15ohmu, l=7.95nH.
The source impedance is 50ohmu.
The goal is :
dB(S(1,1))<=-20 1.5GHz<=f<=2.5GHz
Thank you very much!
alpuslu said:
What is your operating frequency and what are your terminations? If u give i can design for you.Please give detailed information about your need.
You can run optimization on the design you have. From the Optim palette place an optim component and a goal component. enable optimization for each lumped component. You should set a goal for S11<-20dB. There are some examples in help files...
I don't know the details of your active part, if it is LNA from 1.5GHz to 2.5GHz, you could try:
1. Try to use a multi-section matching network, you can use the ADS to design and optimize it.
2. Try to use the transformer feedback, or resistive feedback.
3. Try to use lossy matching network, normally it can be used to trade-off bandwidth at the cost of other aspect (gain, noise, etc..).
4. Use the classic Le(Ls) and Lb(Lg) matching, if necessary you may need to add a capacitor in parallel with Cbe(Cgs) to tune the cut-off frequency Ft a little.