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A voltage-controlled oscillator (VCO) is an electronic oscillator whose oscillation frequency is controlled by a voltage input. The applied input voltage determines the instantaneous oscillation frequency. Consequently, a VCO can be used for frequency modulation (FM) or phase modulation (PM) by applying a modulating signal to the
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Vackář describes a VFO design using this circuit that covers a modest frequency range of 1:1.17. [14] Vackář then describes a variation of the Radioslavia circuit that can cover a frequency range of 1:2.5 [15] or even 1:3. [16] This circuit tries to compensate for some variation in Q over the useful range of the VCO. [17]
The frequency accuracy relative to the clock frequency is limited only by the precision of the arithmetic used to compute the phase. [4] NCOs are phase- and frequency-agile, and can be trivially modified to produce a phase-modulated or frequency-modulated output by summation at the appropriate node, or provide quadrature outputs as shown in the ...