Implementing a sigmoid function with analog circuitry #EE Adafruit Industries Makers, hackers, artists, designers and engineers! [Video]

March 5, 2024 AT 10:24 am

Implementing a sigmoid function with analog circuitry #EE

Michael Wiebusch was playing around with the humble long-tailed pair transistor amplifier in LTSpice. when something interesting happened – not only can it be used as a differential voltage amplifier, but it seems it can also be used to implement a sigmoid function.

Wikipedia states : “A sigmoid function is any mathematical function whose graph has a characteristic S-shaped curve or sigmoid curve.”

The circuit is below:

Check out the analysis in the post here.

Adafruit publishes a wide range of writing and video content, including interviews and reporting on the maker market and the wider technology world. Our standards page is intended as a guide to best practices that Adafruit uses, as well as an outline of the ethical standards Adafruit aspires to. While Adafruit is not an independent journalistic institution, Adafruit strives to be a fair, informative, and positive voice within the community – check it out here: …