I’m going to start a new blog category called “SPICE”, and sub-category called “LTSPICE” to share some of my experiences with the computer program, SPICE, which is an acronym for Simulation Program with Integrated Circuit Emphasis. I use SPICE periodically as my tool of choice to model, simulate, and validation of circuits I am learning about, or designing. Circuits such as passive RLC filters, active filters using operational amplifiers, and filters using commercial off the shelf integrated circuits. There are plenty of sites with examples of using SPICE to simulate circuits. So, why am spending time on the subject? I feel that an Amateur Radio Operator that wants to learn more of the theory of analog circuitry should know how to use SPICE to learn and experiment with circuits. The “Hands on Radio” series in the ARRL publication QST that Ward Silver writes is an example of experimenting with circuits, and with some self-motivated learning, would be more useful with  SPICE.  Inc short, “Hands on Radio” is an excellent series and using SPICE with the series can be used to further one’s knowledge of practical with theoretical. In short, modeling a circuit to understand how the circuit functions in a virtual environment where you can vary all circuit parameters from the baseline design. Using SPICE to  insert standard components in a theoretical design that has non-standard components and see how the circuit responds to the new values; learn about how the circuit functions over frequency, temperature, voltage, etc. before you physically assemble the circuit. In short, the process of designing, modeling, simulating, and validating a design using SPICE will be the emphasis of this category. I plan to used the free program LTSPICE provided by Linear Technology (now Analog Devices) to demonstrate the techniques I will blog about. I will tell you how to obtain LTSPICE and show you how to design circuits from theory to implementation. This effort is not to copy or re-write “Hands On Circuits”. In fact, I don’t plan to repeat the find work Ward had done. I want to share my experiences with SPICE to those Amateur Radio Operations that are interested in this topic. I hope you will enjoy. My next entry will be a short history of SPICE.

73, NM5DC

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