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Dynamic AC Voltage Source: AC_V_ENV



AC_V_ENV is a modulated AC voltage source for Circuit Envelope analysis. A variety of modulating signal types may be generated with this source, including sinusoid, piecewise linear, pulse, saw, square and triangle signals. In addition, you can specify the RF carrier tone, frequency and angle.


Name Description Unit Type Default
ID Voltage source ID Text V1
Signal Signal type   Pulse
SpecType Specify type   Specify freq
Tone Tone number for the RF carrier signal   1

* indicates a secondary parameter

Parameter Details

Signal. Specifies the signal type as "Sinusoid", "PWL", "Pulse", "Saw", "Square" or "Triangle".

SpecType. Specify a frequency or time period.

Tone. Tone number for the signal.

Dynamic Parameters

Name Description Unit Type Default
CarrierAng RF carrier signal angle Angle 0
CarrierFreq RF carrier tone frequency Frequency 1 GHz
Mag Modulating signal amplitude Voltage 1 V
Ang Modulating signal angle Angle 0 Deg
Freq Modulating signal frequency Frequency 1 GHz
Period Modulating signal period Time 1 ns
TIME Time vector Time {0,0.5,1} ns
VOLTAGE Voltage vector Voltage {0,1,0} V
HI High voltage level Voltage 0.5 V
LO Low voltage level Voltage -0.5 V
TW Pulse width Time 0 ns
TR Rise time Time 0 ns
TF Fall time Time 0 ns
TD Time delay Time 0 ns

Dynamic parameters are parameters whose existence depends on the settings of the static parameters. The following is a list of all possible parameters that may display for the AC_V_ENV depending on the settings of the static parameters Signal, SpecType and Tone.

Dynamic Parameter Details

CarrierAng. Displays when Tone > 0.

CarrierFreq. Displays when Tone > 1.

Mag. Displays when Signal is "Sinusoid".

Ang. Displays when Signal is "Sinusoid".

Freq. Displays when SpecType is "Specify freq".

Period. Displays when SpecType is "Specify period".

TIME and VOLTAGE. Displays when Signal is "PWL". See V_PWL for details on these parameters.

HI and LO. Displays when Signal is "Pulse", "Saw", "Square", or "Triangle". Represents the high and low voltage values of the signal.

TW. Displays when Signal is "Pulse". Represents the pulse width in time units.

TR. Displays when Signal is "Pulse" or "Square". Represents the rise time.

TF. Displays when Signal is "Pulse", "Saw", or "Square". Represents the fall time.

TD. Displays when Signal is "Pulse", "Saw", "Square", or "Triangle". Represents the time delay of the signal.

Implementation Details

The complex-valued modulated signal is

where m(t) is the real-valued modulating signal (pulse, square wave, sinusoid, etc.), ω is the angular frequency for the RF carrier tone and φ is the RF carrier angle. If Tone is 1, the RF carrier frequency is determined by the project or document frequencies. If Tone is specified as zero, the RF carrier frequency and angle are assumed zero and the modulated signal becomes the real-valued baseband signal s(t) = m(t).


This element does not have an assigned layout cell. You can assign artwork cells to any element. See “Assigning Artwork Cells to Layout of Schematic Elements” for details.

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