Видео

Example of a xschem schematic simulated with 5 different simulators in 3 different HDL description languages: Spice, Verilog, VHDL.

It is now much easier to draw wires from component pins or from existing wires. Just click and drag. This is an ongoing effort to provide a more user friendly "Point Click and Drag" interface to reduce the need of keyboard commands for some tasks, mostly related to wiring the schematic. The old keyboard command based interface is still available of course.

When a circuit block has been translated to an actual silicon layout, extraction tools create a netlist annotated with parasitic capacitances and resistances. There is thus a need to use this Parasitic EXtracted (PEX) netlist instead of the original xschem schematic.

While plots are displayed moving a cursor in the waveform windows will annotate voltages and currenst (and more) into the schematic in real time.

It is now easier to resize shapes (lines, rectangles, wires). Polygon shapes have more editing functions to allow easy editing/adding/removing control points. Polygons can also be transformed into curved bezier shapes, that are very useful to create more complex symbol shapes.

Many people asked a more standard and user friendly interface for Xschem. It is now possible to click and drag objects to move/copy/resize the circuit.

A complete example from tools installation on Linux to final simulation results of a self calibrating comparator able to sense 1mV differential input. The circuit is drawn with xschem and simulation is done with ngspice. The presentation covers mismatch simulation, where multiple runs with random variation of transistor parameters are performed to ensure correct circuit behavior.

This video explains how to do a simple DC seep simulation of a transistor with Xyce, viewing the results and doing some math operations on the waveforms.

Recorded a 20' talk for the xschem presentation I was supposed to do live at the Free Silicon Conference held in Paris on July 7,8,9 2022. I was not able to present in person due to train transportation issues.

This video explains the ability of Xschem schematic editor to display Ngspice/Xyce simulation data without using an external wave viewing tool. This way waves are saved with the schematic and you don't need to re-create the viewport or re-enter the list of signals to view.

Since all schematic entry commands are available as tcl commands as well it is easy to create regression tests and performance monitors.

Second version of xschem sky130 installation. Now the standard way of doing analog design on skywater-pdk 130nm process with xschem is done with open_pdks. Open_pdks takes care of installing the spice models and xschem libraries. This video does not cover ngspice installation, you may refer to ruclips.net/video/jXmmxO8WG8s/видео.html for ngspice installation part only. UPDATE: the suggested way...

This video is now outdated. Please visit: ruclips.net/video/KgBLByOkJxA/видео.html A step-by-step guide to install from source files: - The schematic editor XSCHEM - The Xschem libraries for the Google-skywater pdk - The skywater process files - the NGSPICE simulator. This will enable you to do analog design with xschem on the skywater process design kit.

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