The Vias anti padding is creating these crazy edge shapes on my copper pours and I don't know if thats ok to send off to a manufacturer
How is this supposed to be done professionally?
STM32WB55CGU6T = MASTER
ADS1299 = SLAVE
400ps rise time before I added 100ohm Resistors.
Estimated new rise time = 2ns
Clock Speed = All I need is 100 KHz max
Full Ground plane .11mm under as reference
Grid increments .750mm
Via sizes = Big .3 x .6mm and Small .45x .2mm
SPI trace length < 9mm
SPI Via size 0.3mm x 0.6mm
Stitching Ground Via Size 0.2mm x 0.4mm
I'm estimating .5ns or 500ps rise time
Frequency estimate 2-3 GHZ
I did the best I can I don't know if there is something I could be doing better.
I would like to reduce noise as much as...
Very sensitive Mixed signal PCB. EEG (Brain wave sensor). 0.010mv sensitivity
I have seen multiple examples of EEG PCB's where they have a MCU and a separate RF module.
Considering the fact that the RF module (MDBT53) is literally a NRF5340 with an antenna, should I just use that to...
AGND AND DGND
BOTH ARE FULL PLANES TAKING UP THE ENTIRE SPACE OF THE BOARD
COLORED OUTLINES ARE JUST WHERE COMPONENTS WILL CONNECT TO THEIR RESPECTIVE GND'S
TOP LEFT WHITE ARROW IS POINTING TO NET TIE'S CONNECTING ANALOG AND DIGITAL GROUND ONLY IN THAT AREA OF THE BOARD
The ic on the top...
GND and GND2 are 2 different ground planes with their own net. I have it like that on purpose to control return paths in different areas. I just want to connect them in this area but Kicad wont let me connect to planes with different via names. How am I supposed to do this?
Ads1299 on left.
MCU input pins on right.
SPI signals going between them on layer 1
Layer 2 is a ground plane
0.11mm dielectric between planes
Frequency of signals is around 60mhz. 8ns rise time.
DOUT is GREEN and returns to DGND pin on the ADS1299
DIN is BLUE and returns the the...
Does anyone have experience with faraday tape and is it good enough to block the signals in this video down to under 20uv, or .02mv if all exposed metal with signals running through it are covered?