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AD8348 IF Input Modification

Question asked by kewang on Apr 6, 2012
Latest reply on Apr 8, 2012 by Qui


    I'm writing to ask about suggestions on AD8348 IF Input Modification. Any advice or help will be greatly appreciated.

    What I got now is an AD8348IF evaluation board. In the AD8348 manual (page 23), it is said that "When the IF input is chosen, the signal path includes a minimum-loss attenuator  (R31 and R32) to transform a 50 ohm input source to the 200 ohm impedance level for which the VGA was designed", "in expense of an 11.46dB power attenuation in the input path" . It also said I can "remove the attenuator (R31 and R32) and replace with a low-loss RF transformer providing the desired 4:1 impedance ratio", so that I can minimize the input power loss. My question is, do you have a recommendation of which RF transformer I should use to get this modification done? A part number or model number will be extremely helpful. Its size needs to match with the evaluation board reasonably well for me to install it.

    Thank you very much and have a good day,

    Sincerely yours,

    Ke Wang