HMC374 S-parameter showed not stable with ADS simulation


One of my customer downloaded the S parameter of HMC374, and tested it with ADS network analyzer.

BUt the result showed that the K factor is less than 1, is the S-parameter wrong or did we made something wrong with the simulation?

Thank you very much.

  • +1
    •  Analog Employees 
    on Nov 19, 2019 7:41 PM

    Hi Henry,

                    I reviewed the S-Parameter file posted to the web. It appears the device is conditionally stable. You can add some loss on the input or output to improve the stability. About 5 ohms in series on the input should fix the issue.