Hi Noel,
If I change L1=18nH to 1nH,Is it effect the RF LO outpower?
| Parameter | Value | Unit | 
| Fout | 15000 | MHz | 
| OUTA_PWR | 50 | |
| Resistor Pull-UP | 0 | ohm | 
| Inductor Pull-UP | 18 | nH | 
| Load Impedance | 50 | ohm | 
| R1 | 0 | ohm | 
| R2 | 1E+13 | ohm | 

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Hi Ray, 
Yes, pull up inductor will affect RFout power. 
1nH to 3nH is our typical recommendation for maximum power.
Regards,
Vicente