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NGSPICE- Usage and Examples - IIT Bombay

ngspice - Usage and ExamplesDebapratim Systems GroupDepartment of Electrical EngineeringIndian Institute of Technology BombayFebruary 2013 Debapratim GhoshDept. of EE, IIT Bombay1/20 IntroductionQ:What is electronic design?A:Given some desiredspecificationsto be achieved, we want to have asystem which can be made by interconnectingknown We want an amplifier with a gain of Elements- This amplifier can be made using a transistor (BJT orMOSFET), or an op-amp, along with some resistors. Known elements arethose whose behaviour can be represented by means of algorithms,equations or specific models. In short, known elements are those whosebehaviour is familiar to we wish to design complex circuits, a circuit simulator isa useful GhoshDept.

A typical example is using an op-amp (operational amplifier) to design a simple amplifier or a filter. Note that, an op-amp is a pre-existing circuit and not a device. It is made of many transistors. NGSPICE allows us to define an op-amp as a subcircuit. A subcircuit is much like an IC- we know its pins to interface with the outside world, but

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