Ivan_
Full Member level 2
Hi guys,
I havt to get the small-signal and the large signal equivalent models of an HEMT with some measurement-based techniques. In order to do that, I need to design a proper test fixture to avoid poor grounding and potential oscillations, for both S-parameters measurements and DC-measurements. I know I have to use bias tees, but despite I did it, some instability took place in DC measurements, resulting in strange I-V curves. I ask: does anybody know any good ustrip geometrical configuration for these measurements? I would really appreciate layout schemes and dimension constrains and rules.
Another important point is the in-fixture post calibration for S params meas. I know the typical TRL method can be used, but I think symmetry of the test fixture can be considered to simplify the procedure. Can anybody plz provide me of info about methods for symmetrical test fixtures and even some matlab code implementing the procedure/s?
Many thanks in advance.
Ivan.
I havt to get the small-signal and the large signal equivalent models of an HEMT with some measurement-based techniques. In order to do that, I need to design a proper test fixture to avoid poor grounding and potential oscillations, for both S-parameters measurements and DC-measurements. I know I have to use bias tees, but despite I did it, some instability took place in DC measurements, resulting in strange I-V curves. I ask: does anybody know any good ustrip geometrical configuration for these measurements? I would really appreciate layout schemes and dimension constrains and rules.
Another important point is the in-fixture post calibration for S params meas. I know the typical TRL method can be used, but I think symmetry of the test fixture can be considered to simplify the procedure. Can anybody plz provide me of info about methods for symmetrical test fixtures and even some matlab code implementing the procedure/s?
Many thanks in advance.
Ivan.