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HMC713LP3E RFIN Resistor Network

What is the purpose of the unbalanced resistor T-network on the evaluation board for RFIN pin 3? 

If it's an impedance converter, what the target output impedance and attenuation?

  • Hello,

    The resistive T-network is for wideband impedance matching of the RFIN.  The network also helps to improve the input return loss of the HMC713LP3E-EVALZ eval board.  Data sheet page 11-4 shows the Input Return Loss graph.  It is about -10dB or better to the wide frequency range.  The network has about 6dB insertion loss.