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Strong peak in ramp signal generation

Category: Datasheet/Specs
Product Number: ADF4159
Software Version: 4.10.6 - July 2015

Hello team,

I am generating a ramp signal from ADF4159 PLL synthesizer whose ramp duration is 2 micro-seconds and delay between ramps is 39 micro-seconds for a LFMCW Radar application. This ramp signal's covering range is 10MHz. Its start frequency is 9.385 GHz and stop frequency is 9.395 GHz.

Using the ADIsimPLL software, I created a simulation file that meets above specifications. And edited the settings in ADF4158-9 GUI accordingly.

I observed the RFout of PLL in signal hound spectrum analyser.

My questions are as following:

1. Why am I getting a peak at 9.385GHz with power level of +6.91dBm? Does it effect my Radar performance as this RFout is considered as transmitter signal?

2. Can I reduce or overcome it by changing the settings in GUI? If so, please let me know.

Thanks and regards,


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