An Overview of System-Level Macromodeling Using Virtual Blocks
An Introduction to Macromodeling
RF.Spice A/D provides an extensive library of black-box virtual blocks that allow you to quickly test and verify new system concepts without getting into the details of particular circuit realizations. A virtual block typically has one or more input pins and one or more output pins. A system-level function or behavior is modeled by the relationship between the input and output voltages. For example, a multiplier block takes two input voltages and outputs their product. An analog frequency doubler takes a single sinusoidal input voltage and produces a sinusoidal output voltage, whose frequency is twice as large as the input frequency.
Example 1: Analog Signal Differentiation
The simplest voltage differentiator can be made based on the basic properties of a capacitor:
[math] i(t) = C \frac{dv}{dt} [/math]
where v(t) and i(t) are the voltage and current of the capacitor and C is it capacitance. Similarly for an inductor, one can write:
[math] v(t) = L \frac{di}{dt} [/math]
where L is the inductance.
