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noise cancelling and bias decoupling

hobbuhobbubbu

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hello guys.

I'm not familiar with English, so I hope you understand even if English is awkward

I have two questions.

First, How does noise canceling happen in this circuit

Second, Why is the Bias coupling necessary, and what does it do in this circuit

This circuit is in "Wide-Band CMOS Low-Noise Amplifier Exploiting Thermal Noise Canceling" - Federico Bruccoleri, Eric A. M. Klumperink, Member, IEEE, and Bram Nauta, Senior Member, IEEE
 

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