LPG
A high efficiency ULP SIP GMSS, NBIoT & LTE-M nRF91 STO LTS for IOT with minimal BOM, ultra-low Iq and dedicated STO PHY (IP). It operates with an advanced LP PSM paired with an low iDRX interval RRC idle to optimize RX dBm gain using cDRX variations and variable iDRX PDCCH.
Created by
chengyin.yao 🚀
Tier 1
23 views
1 follower
Tanuki ⚡🚀
approved LPG ago
Tier approved: 1
Grant approved: $313.00
Sick PCB! I guess im a cool person lol
chengyin.yao 🚀
submitted LPG for review ago
chengyin.yao 🚀
added to the journal ago
Finished project
Made da repo, da bom and all other stuff. found GMSS ANT that I needed to use to be compliant with FCC, CE and other regulations.
Did a final pass on the PCB.
chengyin.yao 🚀
added to the journal ago
Finalized PCB
Final product ^^
Projected ULP duration is 2 months in normal mode.
More in STO and RRC idle mode.
Signals are now all integral and return loops optimized.
chengyin.yao 🚀
added to the journal ago
Compacted board
Made board a lot more compact. Picked specific parts to opt pc and iq, while minimizing surface area.
Rerouted a lot of stuff, reworked bat charge cycle.
chengyin.yao 🚀
added to the journal ago
Continued to route
Routed the stuff.
Kept everything compact and LP. Paid attention to DRX dBm gain and minimized GMSS derivation.
Used techniques to conserve cap polarization for ULT functioning.
chengyin.yao 🚀
added to the journal ago
Continued to route the PCB
Made more progress, sparing the technical details. It's just routing with ULP in consideration with EMC optimizations. I hope to get low noise on all the rails fuck this word count
chengyin.yao 🚀
added to the journal ago
Started to rotue the PCB
Started to route out the PCB. Not much to say. (Well there's a ton of technical aspects but I am not in a mood to yap, I just want to remove this char counter)
chengyin.yao 🚀
added to the journal ago
Found more components
Picked out the converter from the freaking hundreds of different converters from TI, NXP and Micro. Found this integrated inductor boost conv that has only ~300n of Iq.
Also drew other low power stuff
chengyin.yao 🚀
added to the journal ago
Guess what, more drawing
Drew custom symbols, figured out 2nd antenna. added all kinds of modules
Calculated polarizing capacitance to optimize battery life etc.. also found new parts
chengyin.yao 🚀
added to the journal ago
Drew core
Drew core of the schematic
Figured out the GPS antenna tuning which was goddamn obscure
Not much else wwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwww
chengyin.yao 🚀
started LPG ago
1/11/2026 2 PM - Drew core
Drew core of the schematic
Figured out the GPS antenna tuning which was goddamn obscure
Not much else wwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwww
1/11/2026 8 PM - Guess what, more drawing
Drew custom symbols, figured out 2nd antenna. added all kinds of modules
Calculated polarizing capacitance to optimize battery life etc.. also found new parts
1/12/2026 7 PM - Found more components
Picked out the converter from the freaking hundreds of different converters from TI, NXP and Micro. Found this integrated inductor boost conv that has only ~300n of Iq.
Also drew other low power stuff
1/12/2026 10 PM - Started to rotue the PCB
Started to route out the PCB. Not much to say. (Well there's a ton of technical aspects but I am not in a mood to yap, I just want to remove this char counter)
1/13/2026 - Continued to route the PCB
Made more progress, sparing the technical details. It's just routing with ULP in consideration with EMC optimizations. I hope to get low noise on all the rails fuck this word count
1/14/2026 - Continued to route
Routed the stuff.
Kept everything compact and LP. Paid attention to DRX dBm gain and minimized GMSS derivation.
Used techniques to conserve cap polarization for ULT functioning.
1/15/2026 - Compacted board
Made board a lot more compact. Picked specific parts to opt pc and iq, while minimizing surface area.
Rerouted a lot of stuff, reworked bat charge cycle.
1/16/2026 4 PM - Finalized PCB
Final product ^^
Projected ULP duration is 2 months in normal mode.
More in STO and RRC idle mode.
Signals are now all integral and return loops optimized.
1/16/2026 5 PM - Finished project
Made da repo, da bom and all other stuff. found GMSS ANT that I needed to use to be compliant with FCC, CE and other regulations.
Did a final pass on the PCB.