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B — Arbitrary Behavioral Source

The behavioral source creates a voltage or current source whose value is defined by a mathematical expression. This is part of analog behavioral modeling (ABM).

Syntax

B<name> <node+> <node-> V={<expression>}
B<name> <node+> <node-> I={<expression>}
Parameter Description
node+, node- Terminal nodes
V={expr} Behavioral voltage source
I={expr} Behavioral current source

Examples

* Voltage source: half the input
B1 OUT 0 V={V(IN)*0.5}

* Current source: proportional to voltage
B2 OUT 0 I={V(CTRL)*1m}

* Full-wave rectifier
B3 OUT 0 V={abs(V(IN))}

* Conditional (comparator)
B4 OUT 0 V={if(V(IN)>2.5, 5, 0)}

* Multiplier
B5 OUT 0 V={V(A)*V(B)}

Expressions

The expression can use:

  • Node voltages: V(node), V(node1, node2)
  • Branch currents: I(Vsource)
  • Mathematical functions: abs(), sqrt(), exp(), log(), sin(), cos(), if(), min(), max(), etc.
  • Arithmetic operators: +, -, *, /, ** (power)
  • Parameters defined with .PARAM

Supported ABM Forms

SpiceSharpParser supports these analog behavioral modeling constructs:

Form Description
VALUE={expr} Expression-based source (equivalent to V= or I=)
TABLE={expr} Lookup table with piecewise-linear interpolation
POLY(n) Polynomial transfer function