The Linear Circuit Wizard block solves a linear, time-invariant circuit described by a SPICE netlist. The block supports a limited set of SPICE circuit elements and netlist statement syntaxes. For more information about supported circuit elements and netlist statement syntaxes, see Model Linear Circuit Response from SPICE Netlist.

The ports in the Linear Circuit Wizard block are initially parsed from the SPICE netlist. Once the ports are defined, you can add, delete, or modify the order of the ports from the Linear Circuit Wizard block parameter dialog.. The supported ports can either be input or output, and either be voltage or current.

The most common interface definition for an analog circuit is a set of voltages and currents defined at circuit nodes. To create the interface to digital logic and behavioral models from the interface to analog circuits requires some conversion. The Linear Circuit Wizard block constructs the conversion between ports and analog circuit nodes based on the ports definitions that you supply. This enables the Linear Circuit Wizard block to produce a block in your Simulink model that can be connected directly to other types of blocks. For more information, see Ports Supported in Linear Circuit Wizard.

The Linear Circuit Wizard block can model the noise generated by the transistors and resistors in the analog circuit. The spectral density of the device noise can include accurate modeling of flicker noise. The circuit model includes the transfer function from the device noise source to the circuit ports. For more information, see Define Device Noise Using Linear Circuit Wizard.

The Linear Circuit Wizard block outputs a linear circuit block that can be added to the Simulink model. This block is a MATLAB System block with all the input and output ports defined in the Linear Circuit Wizard block parameter dialog box. The generated block requires a fixed-step discrete sample time, which the block either inherits from the surrounding model or defines for itself. For more information, see MATLAB Systems Generated from Linear Circuit Wizard.

The Linear Circuit Wizard block can generate multiple MATLAB System blocks that represent different linear circuit blocks. Once generated, the MATLAB System blocks are independent of their respective Linear Circuit Wizard blocks.

Independent of the generation of MATLAB System blocks, the Linear Circuit Wizard block can also generate a report for ports of the generated block, a report for poles and zeroes of the entire linear circuit, and plot the transfer functions between the input and output ports. For more information, see Verify MATLAB System Block Configuration.