Designing an SDR with PoE Power Supply: Synchronizing SMPS and Managing Heat and Noise
Hey all! Background at the start, I invite comments on it but core questions are at the bottom 
Primarily an embedded sw eng who dabbles a bit in hardware from time to time. I've always wanted to make an SDR and have been hashing out a high level design for one - it boils down to some ECP5 FPGA based board, gigabit etherenet, a DRAM chip, all powered by PoE with some SDR payload. The SDR payload is still a little open, I will either use something integrated like AT86RF215 or use a mixer + ADC - one thing for certain is I will include a MAX2769 for messing about with GNSS signals to try and extract very accurate timing information (this is the core goal, based on some other SDR projects I played with in the past)
Just now I have been looking at how to power the system. For PoE I found several reference designs with LM5070 and plan to use that for the main PSU.
Now normally as an SWE, the hardware I do make is test hardware or silly toys, there aren't many constraints and I get to be lazy and slap down a bunch of LDOs and not worry about it.....
Primarily an embedded sw eng who dabbles a bit in hardware from time to time. I've always wanted to make an SDR and have been hashing out a high level design for one - it boils down to some ECP5 FPGA based board, gigabit etherenet, a DRAM chip, all powered by PoE with some SDR payload. The SDR payload is still a little open, I will either use something integrated like AT86RF215 or use a mixer + ADC - one thing for certain is I will include a MAX2769 for messing about with GNSS signals to try and extract very accurate timing information (this is the core goal, based on some other SDR projects I played with in the past)
Just now I have been looking at how to power the system. For PoE I found several reference designs with LM5070 and plan to use that for the main PSU.
Now normally as an SWE, the hardware I do make is test hardware or silly toys, there aren't many constraints and I get to be lazy and slap down a bunch of LDOs and not worry about it.....
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