HMC465LP5 RFIN bias

Question

In the datasheet, I found the following description. 
 "The input to this device should be A c -coupled" 
 Can I provide the input signal without ac-coupled capacitor? 
 what is the any restriction to connect DC coupled signal to RFIN?

ADIApproved · Accepted Answer

Hi Ogura.Isao, 
 The RFIN must have an AC coupling capacitor. The RFIN is fed directly to the gate of a FET. Any dc applied at RFIN will change the quiescent bias of the amp and potentially damage the device. Please review the simplified pin schematics on page 5 of the datasheet. 
 Regards, 
 Jim B)

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HMC465LP5 RFIN bias