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AD8347 matched load concept

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aashishsharma

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hey i am using IQ demodulator AD8347 and while designing although i have figured out the entire circuit, value of resistances capacitor etc
but i am unable to understand why they have used 200 ohms resister between RFIP/RFIN as well as LOIP/LOIN
page 18 of datasheet https://www.analog.com/static/imported-files/data_sheets/AD8347.pdf
maximum i could find was-" to improve broadband matching to a 50 ohm source 200ohm resistor can be connected from signal side of RFIP coupling capacitor to gnd"
but i dont know what it means???? my concept regarding this matching and all are really weak.
anyone ???
thanks in advance
 

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