Tool/software:
We have developed a custom CC1125-based board operating in the 410–470 MHz frequency band, incorporating an external amplifier with 20 dB gain and a noise figure of 2.5 dB. During transmitter testing, we observed spurious emissions at 10 MHz and 20 MHz offsets from the carrier frequency. Additionally, receiver sensitivity deteriorates at frequencies that are integer multiples of half the TCXO frequency (i.e., 20 MHz multiples).
According to Note 4.14 in the CC1125 datasheet (www.ti.com/.../cc1125.pdf), spurious emissions and sensitivity degradation are observed at specific frequency offsets. Could you please confirm whether this note pertains to the selected reference frequency of the CC1125, specifically the external oscillator (XOSC) or the external clock input? Additionally, could you provide detailed information on the sensitivity degradation figures at multiples of half the oscillator frequency (i.e., 420 MHz, 440 MHz, and 460 MHz) within our operating band?
