How do I terminate third harmonic circuit using optimisation in ADS?

[vinch05]

As you can see I set Z2_Real to short.I want to set Z3 real and imag to open.Doing harmonic termination to enhance pae

 

[BigBoss]

Are you using s-parameters to improve PAE ?? This is not correct method.

 

[vinch05]

I am creating an output match with a fundamental load determined by loadpull, and I read that a short at second harmonic and open at third harmonic would enhance pae.So I was optimising.

 

[BigBoss]

I am creating an output match with a fundamental load determined by loadpull, and I read that a short at second harmonic and open at third harmonic would enhance pae.So I was optimising.

So you're doing simultaneous harmonic termination for a single frequency ? Right ?

 

[vinch05]

So you're doing simultaneous harmonic termination for a single frequency ? Right ?

Yes I guess that is what I am trying to do

 

[BigBoss]

Yes I guess that is what I am trying to do

In that case, you have to find a matching circuit with related Transfer Function that has zero's and/or pole's at Harmonic Contents. In fact, this problem is a kind of Network Synthesis problem. While requesting a certain Reflection @ f1, the circuit will behave open or short circuit @ harmonics.
This is a bit difficult technique for PAs.
In general, PA Designers sweep imaginary and real part of the load impedance to find the optimum target ( whichever is max. Power or max. PAE or max. Gp ) and this technique is called as Load Pull.
There are many examples in ADS installation. You can inspire them to get yours.

 

[vinch05]

Thank you!Is there a tool to determine matching circuit transfer function in ADS ?.I am trying to match at 10GHz.I have the impedance from load pull that gives me the maximum pae at 10GHz.I can easily design the narrowband output match .Howerver the problem is that match to simultaneously match at f1 and harmonics of interest.

 

[BigBoss]

Thank you!Is there a tool to determine matching circuit transfer function in ADS ?.I am trying to match at 10GHz.I have the impedance from load pull that gives me the maximum pae at 10GHz.I can easily design the narrowband output match .Howerver the problem is that match to simultaneously match at f1 and harmonics of interest.

If you've already obtained the Optimum Impedance for a target, you can play on this matching circuit by adding Notches or Parallel LC circuits that don't disturb the main function. Even tough there isn't unique technique to realize such circuits, there are many literatures about how to design. I suggest you to seek the literature.