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sim-measure

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Mis à jour21 avril 2026 à 11:30

Extract waveform measurements from Virtuoso simulation results. Use when measuring voltage, current, gm, gm/Id, bandwidth, settling time, or any simulation metric.

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Source

deanyou

deanyou/virtuoso-cli

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Métiers associésSOC

Basé sur la classification professionnelle SOC

Ingénieurs électroniques (sauf informatique)Architecture et ingénierie·SOC 17-2072

SKILL.md

readonly

name	sim-measure
description	Extract waveform measurements from Virtuoso simulation results. Use when measuring voltage, current, gm, gm/Id, bandwidth, settling time, or any simulation metric.
argument-hint	["measurement target","e.g. \"GBW and phase margin from AC\""]
allowed-tools	Bash(virtuoso *)

Measure Simulation Results

Extract metrics from completed simulations via virtuoso sim measure.

Usage

virtuoso sim measure --analysis <TYPE> --expr '<EXPRESSION>' [--expr '<EXPR2>'] --format json

DC operating point measurements

# Voltage at a node
virtuoso sim measure --analysis dcOp --expr 'value(VDC("/net1"))' --format json

# Drain current
virtuoso sim measure --analysis dcOp --expr 'value(IDC("/NM0/D"))' --format json

# Operating point parameter (gm, gds, vth, etc.)
virtuoso sim measure --analysis dcOp --expr 'value(getData("/NM0:gm" ?result "dcOpInfo"))' --format json
virtuoso sim measure --analysis dcOp --expr 'value(getData("/NM0:ids" ?result "dcOpInfo"))' --format json
virtuoso sim measure --analysis dcOp --expr 'value(getData("/NM0:vth" ?result "dcOpInfo"))' --format json

# Multiple measurements at once
virtuoso sim measure --analysis dcOp \
  --expr 'value(VDC("/net1"))' \
  --expr 'value(IDC("/NM0/D"))' \
  --expr 'value(getData("/NM0:gm" ?result "dcOpInfo"))' \
  --format json

Transient measurements

# Peak voltage
virtuoso sim measure --analysis tran --expr 'ymax(VT("/OUT"))' --format json

# Minimum voltage
virtuoso sim measure --analysis tran --expr 'ymin(VT("/OUT"))' --format json

# Crossing time (settling)
virtuoso sim measure --analysis tran --expr 'cross(VT("/OUT") 0.6 1 "rising")' --format json

# Value at specific time
virtuoso sim measure --analysis tran --expr 'value(VT("/OUT") 10e-6)' --format json

AC measurements

# Gain at DC
virtuoso sim measure --analysis ac --expr 'value(dB20(VF("/OUT")) 1)' --format json

# Unity-gain bandwidth
virtuoso sim measure --analysis ac --expr 'cross(dB20(VF("/OUT")) 0 1 "falling")' --format json

# Phase margin
virtuoso sim measure --analysis ac --expr 'value(phase(VF("/OUT")) cross(dB20(VF("/OUT")) 0 1 "falling"))' --format json

Available signal accessors

Function	Domain	Description
`VDC("/node")`	dc	DC voltage
`IDC("/inst/term")`	dc	DC current
`VT("/node")`	tran	Transient voltage
`IT("/inst/term")`	tran	Transient current
`VF("/node")`	ac	AC voltage (complex)
`IF("/inst/term")`	ac	AC current (complex)
`getData("/inst:param" ?result "dcOpInfo")`	dcOp	Operating point param

Waveform math functions

Function	Description
`ymax(wave)`	Maximum value
`ymin(wave)`	Minimum value
`value(wave time)`	Value at time/freq
`cross(wave val n dir)`	Time when wave crosses val
`dB20(wave)`	20*log10(magnitude)
`phase(wave)`	Phase in degrees
`bandwidth(wave level)`	-3dB bandwidth
`integ(wave)`	Integral over sweep range
`rms(wave)`	RMS value
`average(wave)`	Average value
`delay(wave1 val1 edge1 wave2 val2 edge2 n)`	Propagation delay
`slewRate(wave pct1 pct2 dir)`	Slew rate
`settlingTime(wave final tol)`	Settling time

Noise measurements

# Run noise analysis first
virtuoso sim run --analysis noise --start 10 --stop 100e3 --dec 20 --timeout 120

# Spot noise at 1kHz
virtuoso sim measure --analysis noise \
  --expr 'value(getData("/OUT" ?result "noise") 1e3)'

# Integrated noise (10Hz-100kHz)
virtuoso sim measure --analysis noise \
  --expr 'integ(getData("/OUT" ?result "noise") 10 100e3)'

Common amplifier measurements (complete recipe)

# === DC operating point ===
virtuoso sim run --analysis dc --param saveOppoint=t
virtuoso sim measure --analysis dcOp \
  --expr 'value(VDC("/OUT"))' \
  --expr 'value(IDC("/M1/D"))'

# === AC: gain, GBW, phase margin ===
virtuoso sim run --analysis ac --start 1 --stop 10e9 --dec 20
DC_GAIN=$(virtuoso sim measure --analysis ac --expr 'dB20(value(VF("/OUT") 1))' --format json | jq -r '.measures[0].value')
UGB=$(virtuoso sim measure --analysis ac --expr 'cross(dB20(VF("/OUT")) 0 1 "falling")' --format json | jq -r '.measures[0].value')
PM=$(virtuoso sim measure --analysis ac --expr 'value(phase(VF("/OUT")) cross(dB20(VF("/OUT")) 0 1 "falling")) + 180' --format json | jq -r '.measures[0].value')
echo "Gain=${DC_GAIN}dB  GBW=${UGB}Hz  PM=${PM}°"

# === Transient: slew rate, settling ===
virtuoso sim run --analysis tran --stop 20u
virtuoso sim measure --analysis tran \
  --expr 'slewRate(VT("/OUT") 10 90 "rising")' \
  --expr 'slewRate(VT("/OUT") 90 10 "falling")'

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Measure Simulation Results

Extract metrics from completed simulations via virtuoso sim measure.

Usage

virtuoso sim measure --analysis <TYPE> --expr '<EXPRESSION>' [--expr '<EXPR2>'] --format json

DC operating point measurements

# Voltage at a node virtuoso sim measure --analysis dcOp --expr 'value(VDC("/net1"))' --format json # Drain current virtuoso sim measure --analysis dcOp --expr 'value(IDC("/NM0/D"))' --format json # Operating point parameter (gm, gds, vth, etc.) virtuoso sim measure --analysis dcOp --expr 'value(getData("/NM0:gm" ?result "dcOpInfo"))' --format json virtuoso sim measure --analysis dcOp --expr 'value(getData("/NM0:ids" ?result "dcOpInfo"))' --format json virtuoso sim measure --analysis dcOp --expr 'value(getData("/NM0:vth" ?result "dcOpInfo"))' --format json # Multiple measurements at once virtuoso sim measure --analysis dcOp \ --expr 'value(VDC("/net1"))' \ --expr 'value(IDC("/NM0/D"))' \ --expr 'value(getData("/NM0:gm" ?result "dcOpInfo"))' \ --format json

Transient measurements

# Peak voltage virtuoso sim measure --analysis tran --expr 'ymax(VT("/OUT"))' --format json # Minimum voltage virtuoso sim measure --analysis tran --expr 'ymin(VT("/OUT"))' --format json # Crossing time (settling) virtuoso sim measure --analysis tran --expr 'cross(VT("/OUT") 0.6 1 "rising")' --format json # Value at specific time virtuoso sim measure --analysis tran --expr 'value(VT("/OUT") 10e-6)' --format json

AC measurements

# Gain at DC virtuoso sim measure --analysis ac --expr 'value(dB20(VF("/OUT")) 1)' --format json # Unity-gain bandwidth virtuoso sim measure --analysis ac --expr 'cross(dB20(VF("/OUT")) 0 1 "falling")' --format json # Phase margin virtuoso sim measure --analysis ac --expr 'value(phase(VF("/OUT")) cross(dB20(VF("/OUT")) 0 1 "falling"))' --format json

Available signal accessors

Function

Domain

Description

VDC("/node")

DC voltage

IDC("/inst/term")

DC current

VT("/node")

tran

Transient voltage

IT("/inst/term")

tran

Transient current

VF("/node")

AC voltage (complex)

IF("/inst/term")

AC current (complex)

getData("/inst:param" ?result "dcOpInfo")

dcOp

Operating point param

Waveform math functions

Function

Description

ymax(wave)

Maximum value

ymin(wave)

Minimum value

value(wave time)

Value at time/freq

cross(wave val n dir)

Time when wave crosses val

dB20(wave)

20*log10(magnitude)

phase(wave)

Phase in degrees

bandwidth(wave level)

-3dB bandwidth

integ(wave)

Integral over sweep range

rms(wave)

RMS value

average(wave)

Average value

delay(wave1 val1 edge1 wave2 val2 edge2 n)

Propagation delay

slewRate(wave pct1 pct2 dir)

Slew rate

settlingTime(wave final tol)

Settling time

Noise measurements

# Run noise analysis first virtuoso sim run --analysis noise --start 10 --stop 100e3 --dec 20 --timeout 120 # Spot noise at 1kHz virtuoso sim measure --analysis noise \ --expr 'value(getData("/OUT" ?result "noise") 1e3)' # Integrated noise (10Hz-100kHz) virtuoso sim measure --analysis noise \ --expr 'integ(getData("/OUT" ?result "noise") 10 100e3)'

Common amplifier measurements (complete recipe)

# === DC operating point === virtuoso sim run --analysis dc --param saveOppoint=t virtuoso sim measure --analysis dcOp \ --expr 'value(VDC("/OUT"))' \ --expr 'value(IDC("/M1/D"))' # === AC: gain, GBW, phase margin === virtuoso sim run --analysis ac --start 1 --stop 10e9 --dec 20 DC_GAIN=$(virtuoso sim measure --analysis ac --expr 'dB20(value(VF("/OUT") 1))' --format json | jq -r '.measures[0].value') UGB=$(virtuoso sim measure --analysis ac --expr 'cross(dB20(VF("/OUT")) 0 1 "falling")' --format json | jq -r '.measures[0].value') PM=$(virtuoso sim measure --analysis ac --expr 'value(phase(VF("/OUT")) cross(dB20(VF("/OUT")) 0 1 "falling")) + 180' --format json | jq -r '.measures[0].value') echo "Gain=${DC_GAIN}dB GBW=${UGB}Hz PM=${PM}°" # === Transient: slew rate, settling === virtuoso sim run --analysis tran --stop 20u virtuoso sim measure --analysis tran \ --expr 'slewRate(VT("/OUT") 10 90 "rising")' \ --expr 'slewRate(VT("/OUT") 90 10 "falling")'