While trying to reduce the overall noise level on some boards I’ve been working with, I was looking for a reliable way to first measure the noise level and figure out how best to address the problem. If you can’t measure or visualize it, it’s hard to fully understand it and reliably fix it! Looking for a solution to measure the quality of the GND planes, etc., I came across this helpful appnote from Analog Devices: Measuring Ground Noise. They present a relatively straight-forward setup based on an AD620 instrumentation amplifier that can be used to characterize the GND plane on your boards. The article is worth reading simply because it brings up something a lot of people don’t think about doing boards design: GND. Particularly with high-speed design (anything greater than a few MHz), or with switching-mode power supplies, etc., it’s important to think about the return paths on your boards in addition to the signal transmission lines and part placement. Howard Johnson’s High Speed Digital Design is probably the best book (that I know of!) on the subject, but I haven’t seen very many circuits showing how you can measure noise on the gnd plane, so I thought it was worth sharing the above PDF.
Adafruit is on Mastodon, join in! adafruit.com/mastodon
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.
Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.
Join us every Wednesday night at 8pm ET for Ask an Engineer!
Maker Business — Chip inventories rise as demand falls
Wearables — Go insane with a membrane (button or keypad)
Electronics — Shift away from basic arithmetic
Python for Microcontrollers — Python on Microcontrollers Newsletter: CircuitPython 8.0 RC 1 Out, Board Guides, and Much More! #CircuitPython #Python @ThePSF @micropython @Raspberry_Pi
Adafruit IoT Monthly — Cat Doorbell, Deep Algae Bloom Detector, and more!
Microsoft MakeCode — MakeCode Thank You!
EYE on NPI — Maxim’s Himalaya uSLIC Step-Down Power Module #EyeOnNPI @maximintegrated @digikey
New Products – Adafruit Industries – Makers, hackers, artists, designers and engineers! — New Products 02/01/23 Featuring Adafruit Floppy FeatherWing with 34-Pin IDC Connector!
No comments yet.
Sorry, the comment form is closed at this time.