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456 4. Appendix
The terminals of the controlling branch are denoted by cnode+ and cnode−. Note that as opposed to
the SPICE netlist format the controlling nodes are listed before the terminals of the controlled branch.
4.2.15 OpAmp
type name
syntax
OpAmp {OPname, {cnode+, cnode−, node+, node−}, value v }
denotes an ideal operational amplifier with
finite or infinite gain value v
Circuit element type OpAmp.
cnode+
V1
cnode-
v*V1
For infinite gain, value v must be Infinity. Note that, functionally, an OpAmp is the same as a
voltage-controlled voltage source. The difference to a VCVSource is that during circuit equation
setup another matrix fill-in pattern is used which makes limit calculations for large OpAmp gains
easier.
4.2.16 OTAmp
type name
syntax
OTAmp {OTname, {cnode+, cnode−, node+, node−}, value gm }
denotes an ideal operational
transconductance amplifier with finite or
infinite gain value gm
Circuit element type OTAmp.
cnode+
V1
gm*V1
nodenode+
cnode-
nodenode+