Category: Hardware
Product Number: ADRV9029
We’ve observed issues with Tx QEC calibration failing at low frequencies, particularly 80 MHz, but also at 100 MHz, 120 MHz and 180 MHz. The error message is either “TxQECInit:Decrementing fine phase, coarse value railed” or “TxQECInit:Incrementing fine phase, coarse value railed”. Calibration passes at 79 MHz, 81Mz and 80.01 MHz. We have measured the S11 with a VNC and there do not appear to be any issues with this.
Using a spectrum analyser it appears not much present at all when attempting cal at 80MHz, compared to 79 or 81.
Sample rate 122.88 MHz, Tx synth bandwidth 100 MHz.
