Programming instructions

Voltage-Controlled Triangle Wave
 National Instruments Corporation 1-13 Multisim Component Reference Guide
1.18 Voltage-Controlled Triangle Wave
This oscillator is identical to the voltage-controlled sine wave oscillator except that it outputs
a triangle wave. This oscillator takes an input AC or DC voltage, which it uses as the
independent variable in the piecewise linear curve described by the (control, frequency) pairs.
From the curve, a frequency value is determined, and the oscillator outputs a triangle wave at
that frequency. When two co-ordinate pairs are used, the oscillator outputs a linear variation
of the frequency with respect to the control input. When the number of co-ordinate pairs is
greater than two, the output is piecewise linear. You can change the rise time duty cycle and
the peak and valley values of the output triangle wave by resetting the Output peak high value
and Output peak low value on the model parameter dialog box.
Example
The example shows a triangle wave generator with output frequency determined by a control
voltage.
Control voltage may be DC, controlled by a potentiometer, as is the case for many signal
generators and function generators.
Control voltage may be a continuous variable of any desired shape as required in sweep
generators and spectrum analysers.
In the example shown below, the VCO parameters are set so that control voltage of 0V
produces an output frequency of 100Hz and control voltage of 12V produces an output
frequency of 20KHz.
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