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What's the maximum output frequency of a VCO using dual OPAMP?

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siddharth.gits

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what can be the max output frequency for voltage controlled oscillator using dual op-amp tl082...??? and how the values of r,r1,r2 and c be adjusted to get that frequency...???
 

Re: VCO Using Dual OPAMP

siddharth.gits said:
what can be the max output frequency for voltage controlled oscillator using dual op-amp tl082...??? and how the values of r,r1,r2 and c be adjusted to get that frequency...???
Click to expand...

I am sure, there are many forum members who are able and willing to answer you question.
However, how should we know what parts you are referring to by writing r, r1 .....?
Do you have no circuit diagram?
 

Re: VCO Using Dual OPAMP

It's a triangular/square wave generator. Without knowing the multiplier's scaling factor, no frequency can be calculated.

There's a problem with calculating the maximum frequency in my opinion. You can either operate the circuit a low frequencies distinctly below OP GBW. Then you get almost ideal waveforms and linear VCO behaviour. Or you can try to increase the frequency to the maximum, involving distorted waveforms and non-linear V/f characteristics. The VCO frequency would no longer follow a simple formula in this region. A circuit simulator will answer the question most exactly for high frequencies.
 

Re: VCO Using Dual OPAMP

Who knows if siddharth.gits really wants a squarewave?
For my opinion, it is a pitty that in some cases questioners are not able to give sufficient information about their task.
Thus, I think it is rather inefficient for us to guess and to speculate what he may have in his mind.
That was the background of my former remark regarding the terms "oscillator" and "frequency".
Nevertheless, I think it is not appropriate to use the term "frequency (in Hz)" for a squarewave (better: repetition rate in 1/sec). How would one describe the spectrum of a squarewave that has a period of 1ms?
The signal of 1 kHz consists of other signals of 3, 5, 7 kHz?
I am not very happy with such a sentence.
 

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