Built-in Components Reference

Schemify ships with a standard library of primitive components. All primitives are .chn_prim files.

Passive Components

Resistor (res)

R1  resistor  value=10k  footprint=0402

SPICE: R<name> <n+> <n-> <value>

Parameters: value, tc1, tc2, m (multiplicity), footprint

Capacitor (capa)

C1  capacitor  value=100n  footprint=0402

SPICE: C<name> <n+> <n-> <value> [IC=<initial>]

Parameters: value, ic, m, footprint

Inductor (ind)

L1  inductor  value=10u

SPICE: L<name> <n+> <n-> <value>

Parameters: value, ic, m

MOSFETs

NMOS (nmos4)

M1  nmos  model=nch  w=2u  l=100n  nf=1  m=1

SPICE: M<name> <d> <g> <s> <b> <model> w=<w> l=<l> nf=<nf> m=<m>

Parameters: model, w, l, nf, m, ad, as, pd, ps

PMOS (pmos4)

M2  pmos  model=pch  w=4u  l=100n  nf=1  m=1

Same format as NMOS.

Bipolar Transistors

NPN (npn)

Q1  npn  model=2N3904  m=1

SPICE: Q<name> <c> <b> <e> [<sub>] <model> [m=<m>]

PNP (pnp)

Q2  pnp  model=2N3906  m=1

Diodes

D1  diode  model=1N4148  m=1

SPICE: D<name> <a> <k> <model> [m=<m>]

Sources

Voltage Source (vsource)

V1  vsource  value=1.8

SPICE: V<name> <n+> <n-> <value>

Supports: DC, AC, transient (PULSE, SIN, PWL, etc.)

Parameters: value (DC), ac, type, pulse_params...

Current Source (isource)

I1  isource  value=100u

Behavioral Sources

Kind	SPICE	Description
vcvs	E	Voltage-controlled voltage source
vccs	G	Voltage-controlled current source
ccvs	H	Current-controlled voltage source
cccs	F	Current-controlled current source

Connectivity Symbols

Symbol	Description
vdd	Power rail label (connects to VDD net)
gnd	Ground label (connects to 0/GND net)
lab_pin	Net label (names a wire net)
ipin	Input port (for subcircuits)
opin	Output port (for subcircuits)
iopin	Bidirectional port
noconn	No-connect marker (suppresses DRC warning)

Simulation Primitives

Symbol	Description
code	SPICE code block (.model, .param, .include, etc.)
code_shown	SPICE code block, visible in schematic
simulator_commands	Simulation analysis commands (.tran, .ac, etc.)
probe	Voltage/current measurement probe
ammeter	Current measurement (zero-volt voltage source)

PDK-Specific Components

PDK components are installed via Volare and appear under the PDK namespace:

sky130_fd_pr__nfet_01v8     # SKY130 1.8V NFET
sky130_fd_pr__pfet_01v8     # SKY130 1.8V PFET
sky130_fd_pr__res_xhigh_po  # SKY130 high-resistance poly resistor