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+====== VCO with Quadrature Outputs ======
+[[:resources:tools-software:sigmastudio:toolbox:sources|Click here to return to the Sources section.]]
+|The voltage-controlled oscillator block, typically used for modulation applications, takes a control input signal (green pin) and outputs a sine tone at a particular frequency on the first blue pin, and a cosine signal (90 degree phase shifted copy of the signal) on the second blue pin.|{{ :resources:tools-software:sigmastudio:toolbox:sources:vco_q002.jpg}}|
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+The input value may be from zero to one (5.23 format), and the VCO linearly interpolates its derived value into an output frequency from 0 Hz (0.0 input) to fs/2 (1.0 input). Fs is the sampling frequency.
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+If the input applied is greater than 1, the derived output value will fold back to frequencies below fs/2.
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+To change the source's Sampling Rate, Right-click in the block and select Set Sampling Rate, which will open the Sampling Rate window (default is 44.1 kHz).
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+This cell can be found in the Voltage Controlled subfolder in the Sources section of the toolbox.
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+{{:resources:tools-software:sigmastudio:toolbox:sources:vco_quad_039.jpg?|}}
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