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PNA-X Noise Figure ECAL tuner
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on Aug 23, 2010
on Aug 23, 2010 by daras
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Does it matter how long the cables are that connect the ECal tuner to the PNA-X SOURCE OUT / CPLR THRU connectors? We are using a 12 inch and a 14 inch low loss cable
to make the connection.
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Aug 23, 2010 1:42 PM
there is no set guidance, but the aim should be to minimize the loss from the tuner to the input port of the DUT. The tuner is used to present multiple distinct impedance states to the source port of the DUT and the more spread these states are on the Smith chart, the better the final 50 Ohm Noise Figure calculation will be. any loss in the path from the tuner to the DUT will reduce the spread of the impedance states and too much loss will make the states indistinguishable, which would make for a large error in the computed 50 Ohm Noise Figure.
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