We intend to make a CW ramp radar, so the PA needs to be also be CW biased (correct me if I’m wrong).
QPA1111’s datasheet does not provide any measurement with CW bias, so can it be actually used this way?
Hi, we do not recommend CW operation with QPB1111. For CW applications, the QPB3238N would be a better option for this band.
Hi, the QPB3238N is for 32-36 GHz range, we need a PA to work at 10-10.5 GHz.
QPA1111 has the best price/power ratio in your portfolio for this range, as far as I could find. Do you have any suggestions maybe?
Hi, OK - QPA1111 not QPB1111, I misread it. QPA1111 has a CW power dissipation limit of 65W in the absolute maximum ratings table on page 2. On the same page there is a note: “CW operating requires thermal consideration”, and page 20 shows how the device channel temperature varies with pulse width and duty cycle. So for CW operation, careful thermal design is required to ensure that the device channel temperature is maintained at a level to get the MTTF you need. The application note referenced in the data sheet is essential reading for this. If you’d like to discuss in more detail with an FAE, you can contact appsupport@qorvo.com