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In datasheet of the transistor, CGHV40100, I could not find the power consumption of its. How can I calculate the power consumption? Datasheet of the CGHV40100

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    \$\begingroup\$ That entirely depends on how you drive it \$\endgroup\$ – PlasmaHH Sep 12 '18 at 7:21
  • \$\begingroup\$ Can you give me more detail about it, @PlasmaHH ? I apply 50 V and 0.6 A. \$\endgroup\$ – Aldrich Taylor Sep 12 '18 at 7:25
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    \$\begingroup\$ You are the one having to provide details. How you bias it, what signal you drive into, a schematic would be really useful here. We have no idea what you are doing with it. \$\endgroup\$ – PlasmaHH Sep 12 '18 at 7:35
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This is not an amplifier, it's GaN HEMT where the T stands for Transistor. With such a transistor you can build an amplifier.

You choose a very niche type of transistor, it is designed for high power (more than 100 W) RF applications up to 2.5 GHz. I wonder why you have chosen this type of transistor as it requires a lot of experience to work with them.

By that I mean that this transistor must be used in a certain way, things to consider are:

  • what is the frequency (band) of interest to you
  • how much signal gain do you design the amplifier for
  • what biasing voltages and currents are then needed
  • what will be the matching components at input and output
  • signal distortion, a trade-off against efficiency must be made
  • what cooling solution will you use

To get an indication, from the datasheet, in their 1 GHz measurement / testcase the saturated power is 100 W at an efficiency of 56 %. That means that about 178 Watt is consumed in total. And output is 56% * 178 W = 100 W. So about 78 W is dissipated as heat. That's a lot, good cooling is needed at this power level.

This is just one example case, for your particular case the numbers will be different.

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