Communications Blockset

Voltage-Controlled Oscillator

Implement a voltage-controlled oscillator

Library

Controlled Sources sublibrary of Comm Sources

Description

The Voltage-Controlled Oscillator (VCO) 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 parameter, f_c is the Oscillation frequency parameter, k_c is the Input sensitivity parameter, and is the Initial phase parameter.

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

The input and output signals are both sample-based 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.

See Also

Discrete-Time VCO

Viterbi Decoder

Walsh Code Generator