== The Stages of a Circuit Simulation ==
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Any circuit simulation, regardless of analog, digital, RF or mixed-mode type, involves a number of steps:
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* Construction of the schematic using parts and wires
* Definition of stimuli or sources to excite your circuit
* Definition of observables such as node voltages, branch currents, device powers, digital timing diagrams, port characteristics, etc.
* Simulation of the circuit using one the SPICE solvers
* Visualization of the output data
[[RF.Spice A/D]] consists of a number of tightly integrated tools and utilities that work together seamlessly and provide the ultimate computational power with an intuitive and easy-to-use visual interface. When you start the [[RF.Spice A/D]] application, you are in the '''[[RF.Spice A/D]] Workshop''', with its [[Schematic Editor]] occupying the main window. This is where you assemble your circuit. A circuit is made up of a number of parts like resistors, capacitors, diodes, transistors, voltage and current sources, logic gates, transmission line segments, etc., which are connected to one another using wires. [[RF.Spice A/D]] comes with a very large parts database featuring thousands of passive and active devices including generic models and real parts supplied by major semiconductor device manufacturers. Active device models include no less than six distinct MOSFET models including BSIM3 and BSIM4.