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HMC849A S-parameter model / performance change

Question asked by hitec100 on Mar 27, 2018
Latest reply on Mar 27, 2018 by hitec100

Has the HMC849A RF switch changed in performance recently?

 

The reason for the question: its S-parameter model has changed dramatically since 2017. Below is a plot for the HMC849A S-parameter model downloaded in 2017 versus a plot for supposedly the same model downloaded this month in 2018. As a result of the new 2018 S-parameter model, the simulated VSWR at the RF input for a board that we're currently designing is much greater than it was before using the older 2017 model.

 

If the HMC849A part's performance hasn't changed, what is the reason for the S-parameter model change? Was the original model in error, or is the current model possibly now in error?

 

Plot for HMC849A S-parameter model for Vctl=5V, Ven=0 downloaded in 2017:

 

HMC849A S-parameter model for Vctl=5V, Ven=0 downloaded in 2017

 

Plot for HMC849A S-parameter model for Vctl=5V, Ven=0 downloaded in 2018:

 

HMC849A S-parameter model for Vctl=5V, Ven=0 downloaded in 2018

 

I'm also attaching the S-parameter models for the HMC849A that we downloaded in 2017 and 2018 to this question.

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