Why MESFET is more linear than pHEMT?

[cmosbjt]

When plotting the gm vs. Vgs, MESFET tends to have a wider flat area than pHEMT. From device physics perspective, why is that? Thanks.

 

[cnm]

Very good question! It probably involves lots of semiconductor physics. looking forward to good comments on this too.

 

[vfone]

**broken link removed**

 

[cmosbjt]

**broken link removed**

I read this paper before, but where is the answer? Thanks.

 

[cnm]

I read this paper before, but where is the answer? Thanks.

Not much discussion on the linearity comparison in the paper...

 

[BigBoss]

"Broadband Microwave Amplifiers-Bal.S. Virdee,Avtar S. Virdee,Ben Y. Bentamin" Page 55-56

 

[cmosbjt]

"Broadband Microwave Amplifiers-Bal.S. Virdee,Avtar S. Virdee,Ben Y. Bentamin" Page 55-56

I read this book, I can't find the answer. Page 55-56 don't have the answer neither.

 

[cnm]

I read this book, I can't find the answer. Page 55-56 don't have the answer neither.

In the book, difference between Gm is discussed, but not the linearity. Nice try though.