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two frequencies of logic levels

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rameshrai

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hi,

does two logic levels have different frequencies? and how can we measure the two frequencies in proteus?

thanks
 
does two logic levels have different frequencies?

Logic Levels, are by definition static, therefore have zero frequency. If a logic signal is time-varying between two logic states, then according to Fourier, you can analyze it to find its frequency components.

and how can we measure the two frequencies in proteus?

thanks

Unlikely that a periodic or aperiodic logic waveform would have only two frequency components; more like an infinite series of them...

I know nothing about Proteus. However, finding the frequency components of any arbitrary waveform, be it a logic waveform or something else, requires doing a Spectral Analysis or Fourier Analysis.
 
Is the OP asking about two frequency FSK signalling?

JimB
 
hi,
first sorry for delayed reply

i have two pulses each having different pulse duration and wanted to ask whether they have different frequency and if so how i can get the frequency values.
 
Pulses do not have a "frequency".

If you have a burst of pulses, or a continuing train of pulses, you could say that the "Pulse Repetition Frequency" (PRF) is (say) 1000 Pulses Per Second (PPS), which would be the same as 1000Hz.

Are these two pulses which are of different duration on the same line?
If there is just two pulses, there is really not much you can say about frequency.

JimB
 
If they just have different pulse duration, then that is pulse width modulation (PWM). While PWM is often used for controlling power, it is also a useful method for some types of (e.g., servo) control. To determine the frequency, you need to measure the time for a whole period. That is, from the beginning of the first high (or low) to the beginning of the next high (or low).

John
 
both pulses are on the same line and are alternating one after the other so we cannot say anything about the frequency from the context of pulse repetition, is this so?
 
To have those pulses occurring "one after th other" and never at the same time, they should be ocurring at the same rate. Otherwise, sooner or later one would step on the other.

You are also talking of duration...

You should tell the complete story of your homework.
 
they are reoccurring at the same rate

i just wanted to know whether it was possible to determine the frequencies, but i guess i got the answer

thanks all
 
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