Discrete-Time VCO

(To be removed) Implement voltage-controlled oscillator (VCO) in discrete time

Discrete-Time VCO will be removed in a future release. For more information, see Version History.

Library

Components sublibrary of Synchronization

Description

The Discrete-Time VCO block generates a signal whose frequency shift from the Quiescent frequency parameter is proportional to the input signal. The input signal is interpreted as a voltage. If the input signal is u(t), then the output signal is

$y (t) = A_{c} \cos (2 π f_{c} t + 2 π k_{c} \int_{0}^{t} u (τ) d τ + φ)$

where A_c is the Output amplitude, f_c is the Quiescent frequency, k_c is the Input sensitivity, and $φ$ is the Initial phase

This block uses a discrete-time integrator to interpret the equation above.

This block accepts a scalar-valued input signal with a data type of single or double. The output signal inherits its data type from the input signal. For code generation, the block supports double precision only.

Parameters

Output amplitude: The amplitude of the output.
Quiescent frequency (Hz): The frequency of the oscillator output when the input signal is zero.
Input sensitivity: This value scales the input voltage and, consequently, the shift from the Quiescent frequency value. The units of Input sensitivity are Hertz per volt.
Initial phase (rad): The initial phase of the oscillator in radians.
Sample time: The calculation sample time.

Extended Capabilities

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C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced before R2006a

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R2024a: To be removed

Discrete-Time VCO will be removed. To design voltage-controlled oscillators (VCOs) and phase-locked loops (PLLs), use the Phase-Locked Loops (Mixed-Signal Blockset) blocks.