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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

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