Communications Blockset

Discrete-Time VCO

Implement a voltage-controlled oscillator in discrete time

Library

Controlled Sources sublibrary of Comm Sources

Description

The Discrete-Time VCO (voltage-controlled oscillator) block generates a signal whose frequency shift from the Oscillation 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

where A_c is the Output amplitude, f_c is the Oscillation frequency, k_c is the Input sensitivity, and is the Initial phase

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

The input and output signals are both scalars.

Dialog Box

Output amplitude

The amplitude of the output.

Oscillation 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 Oscillation 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.

See Also

Voltage-Controlled Oscillator

Discrete-Time Signal Trajectory Scope

DPCM Decoder