Hello,
We are using TES0.26.0 to evaluate the receiving system.
When we operate RX with Zero-IF without setting the intermediate frequency or with a small intermediate frequency (approx. 10Hz or less), we see a kind of harmonic spurious at intervals of about 2.8 kHz from the input signal when we input a signal 1 kHz away from the carrier frequency.
Also, if we change the input signal frequency, the ~2.8kHz interval spurious moves as the input frequency changes.
Could you tell us what the cause of the above phenomenon is?
Could you please let us know if there is a way to avoid this behavior?
We have tested and reproduced in the conditions below:
- ADRV9002NP/W1/PCBZ
- Duplex: TDD
- Setup: DMR (24kSPS, 48kSPS) or LTE (1.92MSPS)
- Channels: Channel1
- Carrier frequency: 350MHz, 900MHz, 2400MHz (both TX and RX are driven by the same LO)
- Intermediate frequency: 0Hz, 5Hz, 10Hz
- Signal source: Keysight N5172B
- Input Signal: CW, -50dBm
Best Regards,