The XRF4 FB 3342 card specifications are provided in the following table:
| Parameter | Specification |
|---|---|
| Channel configuration | 2 FB |
| RF shield | Aluminum cover with electrically-conductive chemical conversion coating |
| Interconnection | LPAF-10-01.0-L-06-2-K-TR |
| Frequency Range | 3300-4200 MHz |
| Bandwidths | 3GPP LTE and NR waveforms |
| Minimum return loss | -10 dB |
| FB typical insertion loss | -4 dB |
| FB maximum input power level at minimum DSA setting | 5 dBm |
| Power consumption RX | <1W |
| I2C/SPI/GPIO/TDD logic levels | 0V/3.3V |
| Maximum I2C rate | 1 MHz |
| Maximum SPI rate | 20 MHz |
| Maximum GPIO rate | 20 MHz |
The following figure shows the block diagram for the XRF4 FB Slice 3342 for use in a digital pre‑distortion (DPD) feedback loop. In a feedback loop, the important aspect is gain adjustment and filtering which is provided with DSA and bandpass filtering. The second and third figures show the typical RF small-signal response and group delay for the card.
Figure 1. XRF4 FB Slice 3342 Block Diagram
Figure 2. XRF4 FB Slice 3342 Small Signal Response
Note:
- Sd: S-differential-to-differential (Sdd) parameters
- Ss: S-single-ended-to-differential (Ssd) parameters
- Sss: S-single-ended-to-single-ended parameters
Figure 3. XRF4 FB Slice 3342 Group Delay
