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LMX2595: output power level

SM
Expert 1760 points
Part Number: LMX2595

Hello,

     We need to get two outputs from the LMX2595 at 15GHz. For the same we intend to use the differential outputs of port A (which has the doubler inside) as two single ended outputs. What power level can be expected at each of the outputs in such a configuration,

Thank you in advance, 

  • 0
    TI__Guru** 108130 points

    Hi SM,

    All of the RF power measurement was taken with single-ended output. That is, we measured the power at one of the output differential pins, with the unused pin 50-Ω terminated. So, if we said 0dBm output, then you can expect to get two 0dBm outputs from both pins.

  • 0 in reply to Noel Fung
    Expert 1760 points

    Hello Noel,

           Thank you the answer. Pg 9 of the datasheet gives two output powers at 15GHz (in two configurations, 2dBm and 7dBm). There are two output options resistor pull-up and inductor pull-up. What is the difference between two, does the phase noise, spurious get affected at the higher output power level? 

    Thanks again,

  • 0 in reply to SM
    TI__Guru** 108130 points

    Hi SM,

    The primary purpose of inductor pull up is to get a higher output power. Figure 23 has a plot comparing the output power vs frequency with resistor and inductor pull up. Section 8.1.4 has some additional information. 

    Phase noise and spurs are mainly determined by the PLL and VCO, the pull-up at the output buffer will not alternate these characteristic.