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HMC826 differential output

Question asked by hiwe on Aug 3, 2015
Latest reply on Aug 13, 2015 by DonY

The HMC826 (fractional PLL with integrated VCO) has a differential output (RF_P and RF_N) with a specified output power in the range 8dBm < Pout < 15 dBm with 11 dBm specified as typical.

 

But the HMC826 evaluation board schematic uses a single ended output, RF_P is left unconnected.

 

Is the specified output power also valid for single ended output as done on the evaluation board, or must a 3 dB reduction be expected ?

 

The evaluation board schematic also shows that the connect output is DC biased to 5 V. As far as I can see this is not mentioned in the datasheet.What is the recommended output circuit/biasing for a design using differential output ?

 

Thanks

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