Voltage Controlled Oscillator Using Op Amp

A voltage controlled oscillator is an oscillator which produces oscillating signals waveforms with variable frequency.

Voltage controlled oscillator using op amp.

A 10 hz sawtooth oscillator provides the control voltage in this case. This causes the frequency to rise slowly until it hits a maximum and then falls back to the starting frequency. The frequency of this waveform is varied by varying the magnitude of the input voltage. By varying the input dc.

Once the tap is turned on the water flows into a water bucket thereby filling it slowly. The oscillation frequency varies from few hertz to hundreds of ghz. Comments 0 favorites 2 copies 6 there are currently no comments. The first op amp is an integrator.

After the water bucket is completely filled the entire mass on the bucket side will be more than the fixed mass m placed on the other end. This circuit is a voltage controlled oscillator which is an oscillator whose frequency is determined by a control voltage. For now you can imagine a voltage controlled oscillator vco to be a black box which takes in voltage of variable magnitude and produces. The voltage vin can be further scaled and fed to a digital panel meter to read the rate.

The first op amp works as an integrator. Voltage controlled oscillator vco from the name itself it is clear that the output instantaneous frequency of the oscillator is controlled by the input voltage it is a kind of oscillator which can produce output signal frequency over a large range few hertz hundreds of giga hertz depending on the input dc voltage given to it. It generates the square wave at the output whose frequency is determined by a control voltage. The working of this op amp relaxation oscillator can be explained as follows.

The other form of circuit for a voltage controlled oscillator is shown below which is implemented by using two operational amplifiers. Lm339 is a quad comparator. A voltage controlled oscillator is an oscillator with an output signal whose output can be varied over a range which is controlled by the input dc voltage. It is an oscillator whose output frequency is directly related to the voltage at its input.