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LMX2595: LMX2595 output power

user5898793

Prodigy 40 points

Part Number: LMX2595
Other Parts Discussed in Thread: , LMX2594

Hi TI team,

I have problem with output power of LMX2595. When Frequency lock at 7 GHz, the output power aproximatially -7 dBm. Referance frequency 100 Mhz and doubler enable. Loop filter bandwidth 200 kHz as LMX2595EVM. I use inducter (18 nH) pull up. How i can increase output power ? Do you have any suggestion?

Best Regards,

Fuat

over 5 years ago

0 Shawn Han over 5 years ago

TI__Genius 9920 points

How about the LMX2595 output power register setting?

GUI TICS Pro can save your setting in a .tcs format file.

0 user5898793 over 5 years ago in reply to Shawn Han

Prodigy 40 points

Thank you for quick response.

in the attachment you can find tcs file. In addition to I am changing output power register. Power change approximately 1 dBm.

Best regards

0 user5898793 over 5 years ago in reply to user5898793

Prodigy 40 points

I forget attachment. You can see below. :)LMX2595_23_12.tcs

0 Noel Fung over 5 years ago in reply to user5898793

TI__Guru** 107230 points

Hi Faut,

Were the output power data taken with your own board? Could you share the schematic?

Your register is fine.

0 user5898793 over 5 years ago in reply to Noel Fung

Prodigy 40 points

Hi Noel,

Schematic similar to eval. board. You can see below

0 Dean Banerjee over 5 years ago in reply to user5898793

TI__Mastermind 28001 points

8625.High Frequency Open Collector Outputs.pdfFaut,

At these higher frequencies, consider using a smaller inductor, like 1 NH.

Also, I am attaching this informal document that discusses the output power in depth. It is based on the LMX2594

Regards,

Dean