cap_sw :
A switchable capacitor circuit element.

The cap_sw primitive represents a two-terminal capacitor of which capacitance can be controlled by a third input C. In other words, the capacitance between the two terminals pos and neg switches to a new value indicated by the real-typed input C whenever its value changes. The total charge stored on the capacitor is preserved before and after each switching event.

Since every value-change event of the input C triggers a new computation, the cap_sw primitive is not recommended for modeling capacitance that continuously varies with a voltage or current (use a cap_var primitive for nonlinear, voltage-dependent capacitance). The cap_sw primitive is intended mainly for capacitance that switches between discrete levels (e.g. capacitance programmable via digital control).

Note that this primitive is a pseudo-module to describe a structural netlist of electrical circuits and not a behavioral model by itself. The XMODEL simulator extracts an event-driven behavioral model at run-time based on the circuit network described by these circuit-level pseudo-modules.

Input/Output Terminals

Name	I/O	Type	Description
pos	input	xreal	positive terminal
neg	input	xreal	negative terminal
C	input	real	capacitance

Parameters

Name	Type	Default	Unit	Description
ic	real	`NaN	volts	initial condition
Cpos	real	0.0	farads	pos-to-gnd capacitance
Cneg	real	0.0	farads	neg-to-gnd capacitance