cancel
Showing results for 
Search instead for 
Did you mean: 

STuW81300 RF Output power is lower than expected.

JJose.6
Associate

I am using the STuW81300 as LO generator to generate 12GHz LO. Although I am able to get the frequency out correctly and the PLL is also locking the output power of the signal us at -39dBm (probing) where ideally it should be giving close to -4dBm.

The is some difference in the LOOP FILTER section of my schematic compared to the EVB schematic. Other than this I cannot understand why it is not giving the said output power. I seriously doubt that this could be the cause for this as the PLL is locking and I am able to generate the required frequency.

I am also attaching the Schematic for reference as well as the register initialisation mapping is also given below.

0693W00000QMRtaQAH.pngRegister Initialisation,

0x9,0x48000000

0x8,0x40000003,

0x7,0x39000000

0x6,0x30001000

0x5,0x28000000

0x4,0x20039115

0x3,0x18008002

0x2,0x1000000A

0x1,0x09400001

0x0,0x03E0003C

This discussion has been locked for participation. If you have a question, please start a new topic in order to ask your question
0 REPLIES 0