28. September 2009 by admin.

From: http://dev.emcelettronica.com/using-microchips-op-amp-spice-macro-models

The SPICE macro models for Microchip’s operational amplifiers (op amps) aid in the design and analysis of various circuits by allowing for detailed simulation of the circuit being designed. This app note does not explain how to use the circuit simulator but will give the user a better understanding how the model behaves and tips on convergence issues.

Microchip’s op amp SPICE macro models cover a wide aspect of the op amp’s electrical specifications. Not only do the models cover voltage, current, and resistance of the op amp, but it also covers the temperature and noise effects on the behavior of the op amp.

Microchip’s op amp SPICE macro models were written and tested in Orcad’s PSPICE 10.0 which is equivalent to Cadence PSPICE 15.x. The type of modeling technique that was used to model the op amps is called “Macro Modeling”. It is based on treating the op amp as a black box and using mathematical equivalents of the internal functions. As opposed to macro modeling, transistor level modeling is used for modeling of the device under development and fabrication.

Microchip’s op amp SPICE macro models are provided in netlist format. This is useful for simulating the models in a number of different simulators. Please refer to your simulator software reference manual on how to create a schematic symbol and relating a netlist to the symbol. All SPICE simulation schematic tools are different in their creation of a schematic symbol and relating it to the library file.

Posted in Spice Models, Op Amps, analog | 2 Comments »

29. March 2009 by admin.

Looks like the analog guys at Microchip have a new blog. Check it out. They talk about a new PICDEM Lab kit here. Seems like a nice kit if you’re just starting out.

Posted in 8-bit, analog, Permanent Offer, Microchip, Development Tool, Blogroll | No Comments »