Frequency Modulation

Thread Starter

mghg13

Joined Jul 17, 2013
62
Hello,

Can any one explain to me briefly what is meat by 'the time response of frequency modulation'?

I am not able to find explanation on this in any textbook I have.

thanks
 

Thread Starter

mghg13

Joined Jul 17, 2013
62
What's the context in which this phrase is being used?

I am to perform an experiment on frequency modulation. And one of the objectives of the experiment is 'to investigate the time response of FM'.

In the experiment, a variable amplitude constant frequency sinusoid (modulating signal) is applied to an FM modulator and the output of the modulator is observed with the help of an oscilloscope and a frequency counter. Then the expt is repeated with a constant amplitude but variable frequency sinusoid and the results are compared.

The whole expt is repeated with square waves.

Where in this expt is 'time response' concerned?
 

Kermit2

Joined Feb 5, 2010
4,162
There are only two 'time response' actions of interest in this type circuit.

Time delays in modulator output with response to input change. delay when change starts and 'settle' time when changing input becomes constant again. There are many ways to measure the errors and their rate of occurance depending on what you are investigating and how it pertains to your problem.

(Slew rate measurements when used with square wave inputs could be considered as well.)

Is there anything else it could be? anyone?
 
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