Shared reference catalog

Constructs common to all dialects. Dialect pages overlay these when a matching (kind, name) exists.

Source of truth: reference/_shared/.

Index

Name	Kind	Summary
`.ac`	directive	Small-signal AC frequency analysis
`.dc`	directive	DC sweep analysis
`.end`	directive	End of netlist
`.ends`	directive	End a subcircuit definition
`.ic`	directive	Set initial node voltages
`.include`	directive	Include another netlist file
`.model`	directive	Define a device model
`.op`	directive	DC operating-point analysis
`.param`	directive	Define a named parameter
`.print`	directive	Print analysis results as a table
`.subckt`	directive	Begin a subcircuit definition
`.temp`	directive	Set circuit temperature(s)
`.tran`	directive	Transient analysis
`C`	element	Capacitor
`R`	element	Resistor
`X`	element	Subcircuit instance

Directives

.ac

shared.directive.ac — Small-signal AC frequency analysis

.ac {LIN|DEC|OCT} np fstart fstop

Parameter	Description	Units
`LIN	DEC	OCT`
`np`	Number of points (LIN) or points per decade/octave (DEC/OCT).
`fstart`	Start frequency.	Hz
`fstop`	Stop frequency.	Hz

Examples

.ac DEC 10 1k 1G
.ac LIN 100 1 1Meg

.dc

shared.directive.dc — DC sweep analysis

.dc srcname start stop step

Parameter	Description	Units
`srcname`	Independent source, parameter, or TEMP to sweep.
`start`	Sweep start value.
`stop`	Sweep stop value.
`step`	Increment between points.

Examples

.dc V1 0 5 0.1
.dc TEMP 0 100 25

.end

shared.directive.end — End of netlist

.end [comment]

Parameter	Description	Units
`comment`	Optional trailing comment.

Examples

.end
.end my_circuit

.ends

shared.directive.ends — End a subcircuit definition

.ends [name]

Parameter	Description	Units
`name`	Optional subcircuit name; should match `.subckt`.

Examples

.ends
.ends buffer

See also: shared.directive.subckt

.ic

shared.directive.ic — Set initial node voltages

.ic V(node)=value [V(node2)=value2 ...]

Parameter	Description	Units
`V(node)`	Node voltage to initialize.	V

Examples

.ic V(out)=0
.ic V(in)=1.8 V(out)=0

.include

shared.directive.include — Include another netlist file

.include 'filename'

Parameter	Description	Units
`filename`	Path to the file to include (quotes recommended).

Examples

.include 'models.inc'
.inc 'corners/tt.sp'

See also: shared.directive.model

.model

shared.directive.model — Define a device model

.model mname type (param=value ...)

Parameter	Description	Units
`mname`	Model name referenced by instances.
`type`	Model type (e.g. NMOS, PMOS, D, NPN).

Examples

.model nmos NMOS (VTO=0.7)

.op

shared.directive.op — DC operating-point analysis

.op

Examples

.op

Computes node voltages and bias points. Many simulators also print an operating point before .tran / .ac unless UIC is used.

.param

shared.directive.param — Define a named parameter

.param name=value [name2=value2 ...]

Parameter	Description	Units
`name`	Parameter identifier.
`value`	Numeric value or expression.

Examples

.param rload=1k
.param pi=3.14159

.print

shared.directive.print — Print analysis results as a table

.print {DC|TRAN|AC} ov1 [ov2 ...]

Parameter	Description	Units
`DC	TRAN	AC`
`ov`	Output variable, e.g. V(node), I(Vsrc), VM(node).

Examples

.print TRAN V(out) I(Vdd)
.print DC V(2) V(3)

.subckt

shared.directive.subckt — Begin a subcircuit definition

.subckt name n1 [n2 ...] [params: p=val ...]

Parameter	Description	Units
`name`	Subcircuit name.
`n1...`	External port nodes in order.

Examples

.subckt buffer in out
.subckt inv in out

See also: shared.directive.ends

.temp

shared.directive.temp — Set circuit temperature(s)

.temp t1 [t2 ...]

Parameter	Description	Units
`t1`	Temperature in Celsius (additional values run multi-temp analysis).	°C

Examples

.temp 25
.temp 0 25 85

.tran

shared.directive.tran — Transient analysis

.tran tstep tstop [tstart [tmax]] [UIC]

Parameter	Description	Units
`tstep`	Suggested printing / sampling increment.	s
`tstop`	Final simulation time.	s
`tstart`	Optional start of printing.	s
`tmax`	Optional maximum timestep.	s
`UIC`	Use initial conditions.

Examples

.tran 1n 100n
.tran 1u 1m 0 10u UIC

Elements

C

shared.element.C — Capacitor

Cname n1 n2 value [params...]

Parameter	Description	Units
`n1`	Positive node.
`n2`	Negative node.
`value`	Capacitance.	F

Examples

C1 out 0 1p

R

shared.element.R — Resistor

Rname n1 n2 value [params...]

Parameter	Description	Units
`n1`	Positive node.
`n2`	Negative node.
`value`	Resistance.	ohm

Examples

R1 in out 1k
Rload out 0 50

X

shared.element.X — Subcircuit instance

Xname n1 [n2 ...] subckt_name [params...]

Parameter	Description	Units
`n1...`	Nodes connected to subcircuit ports.
`subckt_name`	Name of a `.subckt` definition.

Examples

X1 a b buffer

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