Other Parts Discussed in Thread: USB2ANY,
Hello
I'm using an lmx2595 in my circuit and have made a evaluating module using the EVM as a reference. Some changes have also been made to simplify the module, and these changes have caused deterioration in phase noise in the 7.5-8 GHz band at around 100kHz offset, as is plotted in the following figure. In other bands no deterioration appears.
The reference signal of 100MHz is given by R&S SMA 100B, and the chip is programmed using a usb2any. Doubler is turned on to set fpd as 200MHz, and the out put is 7.6 GHz, for example. I suspect that something is wrong with my schemit or PCB design.
The schemit is the two plotted below.
Please give some advice about how to solve this problem or any potential cause of the deterioration.
Thank you!
Qiuyi Zhang
