Impedance Matching Network

Question

Hi. 
 I'm trying to create a three-stage amplifier by using HMC8411TCPZ-EP, HMC788A-EP and HMC637BPM5E, and I want to make sure that the circuit does not produce a high power reflection to avoid damages on the power amplifier. Should I still add impedance matching network? The datasheet says its pins are internally matched to 50oohms, but is it okay to add and LC circuit to further optimize its S11 and S22 parameters? Below is the screenshot of the RF circuit.

Thanks, 
 Tina

ADIApproved · Accepted Answer

Hey Tina26 , 
 As you mentioned, all three ADI products are internally matched to 50 ohms. Based on the return loss for both amplifiers, adding an LC circuit to further optimize S11 and S22 could improve performance but may not be necessary. The return loss already looks good for both parts. 
 Regards, 
 Dorant)

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Impedance Matching Network

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