Student is able to run simple programs on a loop without needing to tap a tap chip
All-call for SCuM features in a new tapeout class chip
Daniel Lovellhas a list incl low-power options and some radio improvements
E.g., More resolution on the chipping clock when receiving
Yu-Chi Lin showed a tapeout timeline; schematic needs to be done this semester to make it to tapeout deadline next semester
QP mis-packaged ICs with opaque epoxy, OK for Sulu but bad for localization
MEMS contact sensing looking good so far but devices were dirty and results were inconclusive. Pre-charging output to high and waiting several seconds maintains a digital high on the GPIO input buffer. Would be good to test for how long that charge lasts (data tops out at ~3 s wait time).
Good to test what the threshold voltage of the GPIO drivers is too.
Maybe seeing modulation. 2.4 GHz LO (RF LO after division) changes by 61 MHz when varying supply between 1.8 V and 1.35 V. Also shifting VREF voltage but didn’t have much impact.
IF clock and chipping clock might be slightly misaligned, which would explain low PDR in some situations. IF clock seems to be an outlier in its response to temperature/supply variation vs. the chipping clock and RF Timer (CPU-derived) clock.