Hi,
Currently deciding whether to delay and wait for the QM35825 chip or to design for an existing UWB chip, and having a little more information would help.
- Given that we wouldn’t have full visibility of a TRM of some sort, would the QM35825’s four antenna ports enable either Qorvo or a customer to implement a more spatially precise positioning solution? In my use case, there would not be a swarm but only two ICs.
- Do the additional two RF ports in the corresponding QM35825 variant have a separate receiver, a switch, or some third solution (that a Non-RF engineer wouldn’t think of)?
- Is there currently a footprint or specifications for a footprint publicly available? If not, is it safe to assume that they will be made publicly available shortly after distributor stock has arrived?
Thank you for your time.
Hi,
Basically, the chip allows you to do Fira Ranging (Fira DL TDOA included) and Radar. For each of these use case, when creating the session, you can choose an antenna set to use. Antenna Sets are defined using Configuration & Calibration framework (a set of key/value pairs pushed into the chip). For each antenna set you want to use, you can define the antenna used to Tx and the antenna used to Rx. You can set antenna pairs if you want to retrieve AoA/PDOA.
There are 2 receivers, combining them (Dual Rx mode), increases the sensitivity of the chip. You can also decide to use or not the LNAs for the receiver path. There is a PA on the Tx path, and it is automatically enabled/disabled by the “Adaptive Tx Power” feature.
To understand how antenna are managed, you can look at this pdf. There is a lot to digest in this document, a part explains how Tx Power is managed, and the other part shows the antenna set configuration with examples.
Concerning the last question, I expect the chip footprint to be available soon.