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About linearity of P1dB in high and low temperature of HMC797

Category: Hardware
Product Number: HMC797APM5E

Hi,

Our customer is using Eval-board of HMC797APM5E.

He measured power at ambient temperature +85 deg C and -30 deg C.

I show the result of measurement of power.

[Conditions]

Vdd = 10V

Vgg1 = -0.485 (Idd=400mA)

Vgg2 = 3.5V

Range of Measure: 6 to 18GHz

Please see the red circles in the above pictures, so the output power is waving.

Why does occur the such as phenomenon at ambient 85 deg C and -30 deg C?

If you know the reason of those phenomenon occuring, please tell me it.

And if you know how to solve those phenomenon, please tell me it, too.

Best Regard,

Kakehi