Continuous Wave
Model constant envelope source
- Library:
RF Blockset / Circuit Envelope / Sources
Description
The Continuous Wave block models a constant modulation on a carrier in the RF Blockset™ circuit envelope simulation environment. For an introduction to RF simulation, see the example, Simulate High Frequency Components.
The block implements the relation
or
at the carrier ωk, depending on the source type.
Parameters
Source type — Wave type
Ideal voltage (default) | Ideal current | Power
Ideal Voltage— The block simulates a constant voltage envelope v0 at the specified Carrier frequencies. The envelope has real and imaginary parts specified by the Constant in-phase value and Constant quadrature value parameters.Ideal Current— The block simulates a constant current envelope i0 at the specified Carrier frequencies. The envelope has real and imaginary parts determined by the Constant in-phase value and Constant quadrature value parameters.Power— The block simulates the constant voltage envelopewhere:
P0 is the value of the Available power parameter
Zs is the value of the Source impedance (ohms) parameter.
ϕ is the value of the Angle (degrees) parameter.
Constant in-phase value — In-phase modulations of carrier frequencies
0 V (default) | vector of real numbers | V | mV | kV
In-phase modulations for each of the Carrier frequencies, specified as a vector of real numbers. Specify the units from the corresponding drop-down list.
Dependencies
To enable this parameter, on the Source type tab,
choose Ideal voltage or Ideal
current.
Constant quadrature value — Quadrature modulations of carrier frequencies
0 V (default) | vector of real numbers | V | mV | kV
Quadrature modulations for each of the RF circuit carrier frequencies, specified as a vector of real numbers. Specify the units from the corresponding drop-down list.
Dependencies
To enable this parameter, on the Source type tab,
choose Ideal voltage or Ideal
current.
Source impedance(Ohm) — Input impedance of source
50 (default) | positive real number | complex number
Input impedance of source, specified as a positive real number or a
complex number. The complex number must contain real and imaginary parts
greater than or equal to 1e-18 ohms.
Dependencies
To enable this parameter, on the Source type tab,
choose Power.
Available power — Input impedance of source
0 W (default) | vector of real numbers | W | mW | dBW | dBm
Available power at the specified Carrier frequencies,
specified as a vector of real numbers. Specify the units from the drop-down
list. The default value is
0 W.
Dependencies
To enable this parameter, on the Source type tab,
choose Power. The default value is
0 W
Angle(degrees) — Phase angle of power waves
0 (default) | vector of real numbers
Phase angle of power waves at the specified Carrier
frequencies, specified as a vector of real numbers. The
default value is 0 degrees.
Dependencies
To enable this parameter, on the Source type tab,
choose Power.
Carrier frequencies — Carrier frequencies
0 (default) | vector of real positive numbers | Hz | kHz | MHz | GHz
Carrier frequencies, specified as a vector of real positive numbers. The
elements in the carrier frequencies are combinations of fundamental tones
and corresponding harmonics in the Configuration block. The default
value is 0
Hz.
Add phase noise — Add phase noise
off (default) | on
Select this parameter, to add phase noise to your system with continuous wave source.
Phase noise frequency offset (Hz) — Phase noise frequency offset
0 (default) | scalar | vector | matrix
Phase noise frequency offset, specified as a scalar or vector or matrix with each element units in hertz.
If you specify a matrix, each column should correspond to a non-DC carrier frequency of the CW source. The frequency offset values must be bounded by the envelope bandwidth of the simulation. For more information see, Configuration.
Dependencies
To enable this parameter, select Add phase noise.
Phase noise level (dBc/Hz) — Phase noise level
0 (default) | scalar | vector | matrix
Phase noise level, specified as a scalar or vector or matrix with element unit in decibel per hertz.
If you specify a matrix, each column should correspond to a non-DC carrier frequency of the CW source. The frequency offset values must be bounded by the envelope bandwidth of the simulation. For more information see, Configuration.
Dependencies
To enable this parameter, select Add phase noise.
Automatically estimate impulse response duration — Automatically estimate impulse response duration
on (default) | off
Select this parameter to automatically calculate impulse response for phase noise. Clear this parameter to manually specify the impulse response duration using Impulse response duration.
Impulse response duration — Impulse response duration
1e-10s (default) | scalar
Impulse response duration used to simulate phase noise, specified as a scalar in seconds. You cannot specify impulse response if the amplifier is nonlinear.
Note
The phase noise profile resolution in frequency is limited by the duration of the impulse response used to simulate it. Increase this duration to improve the accuracy of the phase noise profile. A warning message appears if the phase noise frequency offset resolution is too high for a given impulse response duration, specifying the minimum duration suitable for the required resolution
Dependencies
To set this parameter, first clear Automatically estimate impulse response duration.
Ground and hide negative terminals — Ground RF circuit terminals
on (default) | off
Select this option to internally ground and hide the negative terminals. To expose the negative terminals, clear the option. By exposing these terminals, you can connect them to other parts of your model.
By default, this option is selected.
