Circuit Elements

Flags

Some circuit elements have parameters that are flags. For instance, the independent current source has a load flag. A flag is active if it is used. Alternatively, you can assign a value to the flag. A value ≥ 0.5 means the flag is on, anything else means the flag is off. For example:

I1 N001 0 2m load=1

is the same as

I1 N001 0 2m load

Dynamic Nodes

Instead of naming a node directly, its name can be the result of an expression. For instance:

.param CONNECT = "N001"
I1 {CONNECT} 0 2m

is identical to

I1 N001 0 2m

This is mainly useful for library authors to make connectivity dependent on parameters.

List of Components

Component	Syntax
Special functions	Axx n1 n2 n3 n4 n5 n6 n7 n8 + <model> [extra parameters]
Arbitrary behavioral source	Bxx n+ n- <V=... or I=...>
Capacitor	Cxx n+ n- <capacitance> + [ic=<val.>] [Rser=<val.>] + [Lser=<val.>] [Rpar=<val.>] + [Cpar=<val.>] [m=<val.>]
Diode	Dxx A K <model> [area]
Voltage dependent voltage	Exx n+ n- nc+ nc- <gain>
Current dependent current	Fxx n+ n- <Vnam> <gain>
Voltage dependent current	Gxx n+ n- nc+ nc- <transcond.>
Current dependent voltage	Hxx n+ n- <Vnam> <transres.>
Independent current source	Ixx n+ n- <current>
JFET transistor	Jxx D G S <model> [area] [off] +[IC=<Vds,Vgs>] [temp=<T>]
Mutual inductance	Kxx L1 L2 L3... <coeff.>
Inductance	Lxx n+ n- <inductance> + [ic=<val.>] [Rser=<val.>] + [Rpar=<val.>] + [Cpar=<val.>] [m=<val.>]
MOSFET transistor	Mxx D G S B <model> [L=<len>] + [W=<width>] [AD=<area>] + [AS=<area>] [PD=<perim>] + [PS=<perim>] [NRD=<value>] + [NRS=<value>] [off] + [IC=<Vds, Vgs, Vbs> + [temp=<T>]
Lossy transmission line	Oxx L+ L- R+ R- <model>
Bipolar transistor	Qxx C B E [S] <model> [area] + [off] [IC=Vbe,Vce][temp=<T>]
Resistor	Rxx n1 n2 <value>
Voltage controlled switch	Sxx n1 n2 nc+ nc- <model> + [on,off]
Lossless transmission line	Txx L+ L- R+ R- ZO=<value> + TD=<value>
Uniform RC-line	Uxx n1 n2 ncommon <model> + L=<len> [N=<lumps>]
Independent voltage source	Vxx n+ n- <voltage>
Current controlled switch	Wxx n1 n2 <Vnam> <model> + [on,off]
Subcircuit	Xxx n1 n2 n3... <subckt name>
MESFET or IGBT transistors	Zxx D G S model [area] [off] + [IC=<Vds,Vgs>]
Frequency Response Analyzer	@xx fstart=<val> fend=<val> + [delay=<val>] [oct=<val>] + [fcoarse=<val>] [nmax=<val>] + [[vpp0=<val>] [[vpp1=<val>] + [f0=<val>f1=<val>]]] + [tavgmin=<val>] [tsettle=<val>] + [rpar=<val>] [flist=<values>] + [acmag=<val>] [acphase=<val>] + [refnode=<netname>] + [intnode=<netname>]
Frequency Response Analysis Probe	&xx o+ o- i+ i-