Query about AD8375's Output Design

Hi, there

I choose AD8375 because of It's IMP data only ( i.e., 2nd harmonic ). 

In evaluation board schematic I need some clarification,

Below things are I observed from the  evaluation schematic ,

  1. 1. There is no intersection loss in the input matching circuit.
  2. 2. But the output matching network has 11 dB insertion loss because of the resistors,

Now my Question " Is it possible to use the output matching network a like in the input ?"

Please check the resistors values in the input & output matching networks.

Clarify my doubts

Thanks!

Br,

Wayne

  • 0
    •  Analog Employees 
    on Dec 12, 2013 8:04 PM

    Hello Wayne,

    At the input of the AD8375, there is a 3:1 impedance transformer and at the output there is a 1:1 transformer.  The transformer dictates whether a matching network is needed or not.  The 3:1 transformer takes care of the impedance matching at the input and because of this reason there is no matching network.  The bandwidth of an impedance tranformer is not as wide as a 1:1 transformer.  Therefore, depending on your desired frequency of operation, you can choose to use a matching network or impedance transformer.

    Qui

  • 0
    •  Analog Employees 
    on Aug 2, 2018 2:31 PM
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

    Thank you,
    EZ Admin