Frequency??

[mohammed elzaq]

what is exactly the meaninig, rule , controlling of the frequency in the circuits

 

[mohammed elzaq]

please anyone reply
i know that my question is silly but belive me im not holding the basics.
im in th 3rd year-4th

 

[Nigel Goodwin]

Sorry, but the question doesn't make any sense?, what context is it to with?.

 

[mohammed elzaq]

i mean , for example: when we are taking about the distortion in the signal , it may refer to the frequency.
my question is how the frequency can affect the signal, and how can we calibrate the signal from the frequency side?

 

[Styx]

Are you talking abt noise?

if you are then all signals (via forier Analysis) can be broken down into a sinusoidal singals of different freq and phase shift.

Thus all noise is is unwanted signal. It could be 50Hz pickup or 600kHz switching from DCC converters

and as to "calibrate the signal fro mte freq side" are you talking abt filtering


???

 

[audioguru]

Most audio amplifiers have a very high gain and use negative feedback to reduce the gain and distortion. Since each stage in an amplifier has phase-shift, the amplifier's high frequency response is reduced to avoid oscillation. With the highs reduced, also the negative feedback at high frequencies is reduced resulting in higher distortion at high frequencies.

Here's the distortion vs frequency for a TL07x opamp:

 

[checkmate]

Your question is probably not specific enough. If we are talking about how a system (eg filter, amplifier etc) modifies a signal, we usually call it the frequency response, in which further comprises a magnitude and phase responses.

As for distortion, it is usually more dominant in high frequency signals. This is because the electronic properties of all conductors would be more pronounced. During RF design for example, you will even have to take into account the dimensions of your pcb tracks and wires, wire spacing etc as all these contribute to stray capacitances and inductances. You can even make capaciters and inducters out of wires!

 

[Russlk]

I think you need to look into Fourier Analysis. Distortion of a sine wave can be represented as a sum of harmonic frequencies.