Maitry07
Advanced Member level 4
Hello support team,
I have implemented direct conversion method to generate I and Q samples from the RF frequency. and then I am using FPGA IP core to convert I and Q samples to amplitude measurement. I am taking digital samples of measured amplitude.
My input RF-ADC has 14 bit resolution and having very high dynamic range.
When I am applying RF input power -15 dBm to -2 dBm, I am getting accurate amplitude measurement having accuracy of 0.11 dB within 1,00,000 samples.
As I am using function generator to generate 35 MHz RF input. In order to verify the lower amplitude , I have tried attenuator of 30 dB to generate -45 dBm RF input. But I have observed that with the lower power of -45 dBm, my amplitude measurement accuracy becomes poor near to 1.9 dB within 1,00,000 samples.
What should be the reason behind that? Can attenuator of 30 dB provide very high group delay which further reduce my amplitude accuracy?
because my RF-ADC has very high dynamic range. then why I am not getting good accuracy with lower amplitude?
Instead of using function generator+attenuator to generate lower RF amplitude, should I use stable signal generator like keysight that can directly provide stable lower amplitude RF signal?
Awaited your response.
I have implemented direct conversion method to generate I and Q samples from the RF frequency. and then I am using FPGA IP core to convert I and Q samples to amplitude measurement. I am taking digital samples of measured amplitude.
My input RF-ADC has 14 bit resolution and having very high dynamic range.
When I am applying RF input power -15 dBm to -2 dBm, I am getting accurate amplitude measurement having accuracy of 0.11 dB within 1,00,000 samples.
As I am using function generator to generate 35 MHz RF input. In order to verify the lower amplitude , I have tried attenuator of 30 dB to generate -45 dBm RF input. But I have observed that with the lower power of -45 dBm, my amplitude measurement accuracy becomes poor near to 1.9 dB within 1,00,000 samples.
What should be the reason behind that? Can attenuator of 30 dB provide very high group delay which further reduce my amplitude accuracy?
because my RF-ADC has very high dynamic range. then why I am not getting good accuracy with lower amplitude?
Instead of using function generator+attenuator to generate lower RF amplitude, should I use stable signal generator like keysight that can directly provide stable lower amplitude RF signal?
Awaited your response.