modulator
Modulator object
Description
Creation
Properties
Name
— Name of modulator
'Modulator'
(default) | character vector
Name of modulator, specified as the comma-separated pair consisting of
'Name'
and a character vector. All names must be
valid MATLAB® variable names.
Example: Name='mod'
Model
— Conversion type
'mod'
(default) | 'demod'
Since R2024b
Conversion type, specified as either:
'mod'
— Modulator'demod'
— Demodulator
Example: Model='demod'
Gain
— Available power gain
0
(default) | nonnegative scalar
Available power gain, specified as a nonnegative scalar in dB.
Example: Gain=10
NF
— Noise figure
0
(default) | real finite nonnegative scalar
Noise figure, specified as a real finite nonnegative scalar in dB.
Example: NF=10
OIP2
— Second -order output-referred intercept point
Inf
(default) | real scalar
Second-order output-referred intercept point, specified as a real scalar in dBm.
Example: OIP2=8
OIP3
— Third -order output-referred intercept point
Inf
(default) | real scalar
Third-order output-referred intercept point, specified as a real scalar in dBm.
Example: OIP3=10
LO
— Local oscillator frequency
1e9
(default) | real finite positive scalar
Local oscillator frequency, specified as a real finite positive scalar in Hz.
Example: LO=2e9
ImageReject
— Ideal image reject filtering
true or 1
(default) | false or 0
Ideal image reject filtering at the input of the modulator, specified as a
numeric or logical 1 (true) or 0 (false)
. Setting this
property to false or 0
might affect harmonic balance
results.
Example: ImageReject=1
Example: ImageReject=true
ChannelSelect
— Ideal channel select filtering
true or 1
(default) | false or 0
Ideal channel select filtering at the output of the modulator, specified
as a numeric or logical 1 (true) or 0 (false)
. Setting
this property to false or 0
might affect harmonic balance
results.
Example: ChannelSelect=1
Example: ChannelSelect=false
Zin
— Input impedance
50
(default) | positive real part finite scalar
Input impedance, specified as a positive real part finite scalar in ohms. You can also use a complex value with a positive real part.
Example: Zin=40
Zout
— Output impedance
50
(default) | positive real part finite scalar
Output impedance, specified as a scalar in ohms. You can also use a complex value with a positive real part.
Example: Zout=40
NumPorts
— Number of ports
2
(default) | scalar integer
Number of ports, specified as a scalar integer. This property is read-only.
Terminals
— Names of port terminals
{'p1+' 'p2+' 'p1-' 'p2-'}
(default) | cell vector
Names of port terminals, specified as a cell vector. This property is read-only.
Object Functions
clone | Create copy of existing circuit element or circuit object |
Examples
Modulator Element
Create a downconverter modulator with a local oscillator (LO) frequency of 100 MHz.
m = modulator(Model='demod',LO=100e6)
m = modulator: Modulator element Name: 'Modulator' Model: 'demod' Gain: 0 NF: 0 OIP2: Inf OIP3: Inf Zin: 50 Zout: 50 LO: 100000000 ImageReject: 1 ChannelSelect: 1
Build Modulator Circuit
Create a modulator object with a gain of 4 dB and local oscillator (LO) frequency of 2 GHz. Create another modulator object has an output third-order intercept (OIP3) of 13 dBm.
mod1 = modulator(Gain=4,LO=2e9); mod2 = modulator(OIP3=13);
Build a two-port circuit using the modulators.
c = circuit([mod1 mod2])
c = circuit: Circuit element ElementNames: {'Modulator' 'Modulator_1'} Elements: [1x2 modulator] Nodes: [0 1 2 3] Name: 'unnamed'
RF Budget Analysis of Series of RF Elements
Create an amplifier with a gain of 4 dB.
a = amplifier(Gain=4);
Create a modulator with an OIP3 of 13 dBm.
m = modulator(OIP3=13);
Create an N-port element using passive.s2p
.
n = nport('passive.s2p');
Create an RF element with a gain of 10 dB.
r = rfelement(Gain=10);
Calculate the RF budget of a series of RF elements at an input frequency of 2.1 GHz, an available input power of –30 dBm, and a bandwidth of 10 MHz.
b = rfbudget([a m r n],2.1e9,-30,10e6)
b = rfbudget with properties: Elements: [1x4 rf.internal.rfbudget.Element] InputFrequency: 2.1 GHz AvailableInputPower: -30 dBm SignalBandwidth: 10 MHz Solver: Friis AutoUpdate: true Analysis Results OutputFrequency: (GHz) [ 2.1 3.1 3.1 3.1] OutputPower: (dBm) [ -26 -26 -16 -20.6] TransducerGain: (dB) [ 4 4 14 9.4] NF: (dB) [ 0 0 0 0.1392] IIP2: (dBm) [] OIP2: (dBm) [] IIP3: (dBm) [ Inf 9 9 9] OIP3: (dBm) [ Inf 13 23 18.4] SNR: (dB) [73.98 73.98 73.98 73.84]
Type the show
command at the command window to display the analysis in the RF Budget Analyzer app.
show(b)
Version History
Introduced in R2017aR2024b: Specify type of conversion using Model
property
Use the new Model
property in the
modulator
object to specify the type of conversion as
modulation or demodulation.
R2024b: ConverterType
property will be removed in future release
The ConverterType
property of the modulator
object will be removed in a future release. Use the new Model
property instead.
When executing code with the modulator
object that use the
ConverterType
property, the software will replace this
property with the new Model
property.
R2023b: Recommended over rfckt.mixer
modulator
is recommend over rfckt.mixer
.
rfdata.ip3
, rfdata.power
, and
rfdata.nf
because it enables you to:
Create a two-port modulator element.
Specify third-order intercept points.
Specify the noise figure value.
Build a
circuit
object with a modulator element.Model a modulator in an RF chain created using an
rfbudget
object or the RF Budget Analyzer app.Export the modulator element to RF Blockset™ or to
rfsystem
for circuit envelope or idealized baseband analysis.
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