Other Parts Discussed in Thread: LMX2595
Testing the LMX2595 EVM and the output power at 8 GHz without doubler enabled is good, around 3.62 dBm with 50 Ohm Resistor pull-up, and around 6.92 dBm with Inductor pull-up. However, when I enable the doubler to get 16 GHz the power decreases dramatically to -30.3 dBm with 50 Ohm Resistor pull-up, and around -26 dBm with Inductor pull-up. Per the datasheet P.63 Output power graph Fig-58, the Output power at 16 GHz should be around -1 dBm. Changing DBLR_IBIAS_CTRL1 does not improve output power, and twiddling the OUTA_PWR register in TICS Pro has little effect as well. The initial output inductor and capacitors were not designed for 16 GHz and the Output power results were 5 - 7 dB worse then the numbers I measured above after re-tuning the output to a 1nH inductor resonant at 16 GHz and 0.3pF capacitor resonant at 16 GHz.. I already designed this part into a product and the board is in fabrication so I'm panicking about the output power. Any suggestions to improve output power are appreciated.