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AD8342 input matching

Question asked by veera on Sep 19, 2012
Latest reply on Sep 19, 2012 by Dzianis

The AD8342 mixer has input impedance of 1K ohm. We would like to connect RF signal (220 MHz) to the input port from a 50 ohm SMA connector.

So can we directly connect this SMA to RFinput pin using shunt resistor this pin. Will the only degradation be gain reduction (compared to matched RF port) or do we have some other issues? Since the active mixer considers only Voltage input, I feel connecting from 50 ohm to either 100 or 500 ohm shunt will only enhance the gain rather than causing return loss. Am I correct in this point?

 

We cannot have matched network because, our Bandwidth is very high (40 MHz)

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