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how to measure IIP3 for the circuit - urgent help needed

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narendar

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measuring IIP3 --urgent

how to measure IIP3 for this circuit:
i mean to what resistance the i/p and o/p ports are to be matched?
can i measure it directly ?
or should i have to add any extra circuitry?
the i/p power varies from -85 to -15dBm considering 50ohm and operating freq is 70M
its urgent
thanks in advance
 

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