OS X Update, X11, and XQuartz

I do all of my circuit design and layout as well as some software development by running X11 on a Macbook Pro that’s about 3-4 years old (Snow Leopard.) The basic flow involves logging in to a server at work…

A Simple Fix For A Simple Circuit

I asked a student last week to throw together a quick breadboard circuit for testing power/volume relationships for speakers. I suggested the good ol’ LM386 from National Semi. This audio power amplifier has been around as long as I can…

Butterflies, Nullclines, and Arrows

In my last post, I began with three questions: Each line of the butterfly curve is the DC transfer function of one inverter in the SRAM cell.  Why does it make sense to draw the DC transfer function of an…

A "Bit" of Confusion

The six transistor SRAM cell is one of the most prevalent circuits in microelectronic design. Yet, when I talk to an engineer or a student about SRAM noise margins, the discussion is usually mired in misunderstanding and confusion about what…

After presenting some work at this year’s Design Automation and Test in Europe (DATE) conference, I was finally able to make some of my analysis software publicly available.  I decided to make a site specifically dedicated to “free” software tools…