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Gain flatness improvement and stability

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Hello

Can anyone discuss how to improve the gain flatness in LNA. I am using a two staged resistive feedback amplifier with cascode configuration. My gain roll off ivery fast. How can I reduce the quick gain roll off??

Also, how can we establish stability in any LNA? How to move poles out and away from the desired frequency band.

thanks
 

1) make sure your Vcc caps are low ESR in passband.. optimum 603 parts are < 50pF
2) calculate and test the return loss, gain of all S parameters. LO Leakage is important too
3) verify your dielectric constant on substrate with a test pattern. It may be lower than your think. at higher f.
4) attention to physical details and component guidelines are critical
5) for more details until you offer specs and details https://kettering.academia.edu/Sher...OS_Low_Noise_Amplifier_with_2.6_GHz_Bandwidth
 

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