Sinusoid

Model DC offset and sinusoidal modulation

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Libraries:
RF Blockset / Circuit Envelope / Sources

Description

The Sinusoid block implements a voltage or current source that provides a DC offset and sine wave modulation. This block can be used with each listed block carrier in the circuit envelope environment.

The block implements the following voltage (or current) relationships for the in-phase (u_i), and quadrature (u_q), components of the k^th listed block carrier:

$$\begin{array}{l}{u}_{k,i}(t)=D_i+A_i\sin (w_k(t-\tau ))\\ u_{k,q}(t)=D_q+A_q\sin (w_k(t-\tau ))\end{array}$$

where:

• D_i and D_q are DC offsets.

• A_i and A_q are in-phase and quadrature amplitudes.

• τ is the time delay.

• ω_k is the specified modulation frequency at a given carrier frequency f_k.

• t is the time.

Note

Sinusoid block does not support frame-based processing (supported by the Configuration blocks) as it uses SL Sine wave block. This block errors if the Samples per frame is more than 1 in the configuration block.

Sinusoid block mask icons are dynamic and show the current type of source. This table shows you how the icons on this block vary based on the type of source you set on the Source type parameter on the block.

Source type: Ideal voltage	Source type: Ideal current

Examples

Validating IP2/IP3 Using Complex Signals

Run a two-tone experiment to measure the second- and third-order intercept points of an amplifier.

• Open Script

Parameters

Source type — Wave type

Ideal voltage (default) | Ideal current

Wave type, specified as:

• Ideal Voltage — The block simulates a voltage envelope v(t) at the specified Carrier frequencies.

• Ideal Current — The block simulates a current envelope i(t) at the specified Carrier frequencies.

Offset in-phase — In-phase offset

0 V (default) | 0 A | vector of real or complex numbers | V | mV | kV | A | mA | uA | kA

In-phase offset for each of the RF circuit carrier frequencies, specified as a vector of real or complex numbers. Specify the units from the corresponding drop-down list. The units are in volts for Ideal Voltage and amperes for Ideal Current.

Offset quadrature — Quadrature offset

0 V (default) | 0 A | vector of real or complex numbers | V | mV | kV | A | mA | uA | kA

Quadrature offset for each of the RF circuit carrier frequencies, specified as a vector of real or complex numbers. Specify the units from the corresponding drop-down list. The units are in volts for Ideal Voltage and amperes for Ideal Current.

Sinusoidal amplitude in-phase — In-phase amplitude

0 (default) | vector of real or complex numbers | V | mV | kV | A | mA | uA | kA

In-phase amplitude, specified as a vector of real number or a complex number. Specify the units from the corresponding drop-down list. The units are in volts for Ideal Voltage and amperes for Ideal Current.

Sinusoidal amplitude quadrature — Quadrature amplitude

0 (default) | vector of real or complex numbers | V | mV | kV | A | mA | uA | kA

Quadrature amplitude, specified as a vector of real number or a complex number. Specify the units from the corresponding drop-down list. The units are in volts for Ideal Voltage and amperes for Ideal Current.

Sinusoidal modulation frequency — Modulation frequency

0 (default) | vector of real or complex numbers | Hz | kHz | MHz | GHz

Modulation frequency at each of the RF circuit carrier frequencies, specified as a vector of real number or a complex number. Specify the units from the corresponding drop-down list. Th

Time delay — Time delay of modulation

0 (default) | vector of real | s | ms | us | ns

Time delay of modulation, specified as a vector of positive numbers. Specify the units from the corresponding drop-down list.

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.

Ground and hide negative terminals — Ground RF circuit terminals

on (default) | off

Select this parameter to ground and hide the negative terminals. To expose the negative terminals, clear the parameter. By exposing these terminals, you can connect them to other parts of your model.

By default, this option is selected.

Version History

Introduced in R2010b

R2021b: Sinusoid block icon updated

Starting in R2021b, the Sinusoid block icon is now updated. When you open a model created before R2021b containing a Sinusoid block, the software replaces the block icon with the R2021b version.