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Stability of Power Amplifier

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maroc

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Hello all,

This is the first time I design a PA, and I want to check if its stable or not using ADS. Its a Class J, 10W gan amplifier,

Thanks
 

Class-J actually is just a very well optimized Class-AB for input/output matching and harmonics terminations, to get best linearity and efficiency.
For a linear Class-A PA can be applied the low signal S parameters (and K factor) to get stability information.
Probably the same thing could be applied for Class-AB or Class-J in your case, at least to get some stability information.
 
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    maroc

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vfone said:
Class-J actually is just a very well optimized Class-AB for input/output matching and harmonics terminations, to get best linearity and efficiency.
For a linear Class-A PA can be applied the low signal S parameters (and K factor) to get stability information.
Probably the same thing could be applied for Class-AB or Class-J in your case, at least to get some stability information.
Click to expand...

Thanks. I used a series resistor in gate to stabilize but have some problem at low frequency. What to do at this point and if I use a parallel capacitor with the resistor, Whats the role of it ?
 

A gate resistor is a good option to improve stability (check the gain change), but a cap may affect the matching vs frequency, and needs some optimization for your specific case.
 

Hello maroc
which transistor are you using?? Even i am going for a PA thats class AB.......for x band.......output is 10W.......using ads.........can you show your ads results!
 

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