as upto 3db only the amplifier gives the linear output & after that it gives non linear so it is difficult to determine it's characteristics.also up to 3 db it's energy efficiency is 70.3%. ANSWER: It imply that the amplitude on the output is half.....................
Time constant = R C C = time constant/R R = time constant/C When used as a filter, Cutoff frequency = 1 / (2 pi) R C R = 1 / (2 pi) (cutoff frequency) ( C ) C = 1 / (2 pi) (cutoff frequency) ( R )
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The ration of a frequency to its total frequency is called relative frequency.
3db frequency is the frequency at which the value in the graph is reduced by 3db level It's also known as the half-power point.
Amplifiers react differently to different frequencies. The amount that an amplifier reacts is usually measured in power (decibels). At a certain frequency (usually higher frequencies) the amplifier will react (output) only 50% of the power it is given (this works out to -3dB) this is the standard cutoff frequency and the cutoff region is anywhere below -3dB on a bode plot(This is a plot which shows the frequency input versus the response. These are very common when talking about amplifier characteristics).
it is the frequency at which the current amplification drops 3dB below its low frequency value.
The cutoff frequency of filter depends upon the value of capacitor and resistance. Therefore, below cutoff frequency or above this frequency, capacitor allow to pass all other frequencies.
The cutoff frequency of filter depends upon the value of capacitor and resistance. Therefore, below cutoff frequency or above this frequency, capacitor allow to pass all other frequencies.
The -3dB point is the point of half power. In a filter, the -3dB point, more commonly called the half-power point, is the point where the output power is one half the input power. A bandpass filter has two half-power points, and the distance between them is called the bandwidth, whereas a low-pass or high-pass filter has one half-power point, which is called the cutoff frequency. In terms of voltage, the half-power point is where the voltage is 0.707 (1 / square root(2)) of the input voltage.
zero
3 dB implies 1/2 the power and since the power is proportional to the square of voltage, the voltage will be 0,707 of the passband voltage. sqrt(0.5) = 0.707
ANSWERED MY MUHAMMAD WALEED SHAIKH first of all we have to know that about band,so band is range of frequency which we have selected for example:we have a low pas filter it frequency always started from initial or 0 HZ upto cutoff frequency and here remember that cutoff frequency we will have to select after cutoff signal is rapidly down now about band rate so your signal is band at certain rate is called band rate.
as upto 3db only the amplifier gives the linear output & after that it gives non linear so it is difficult to determine it's characteristics.also up to 3 db it's energy efficiency is 70.3%. ANSWER: It imply that the amplitude on the output is half.....................
Time constant = R C C = time constant/R R = time constant/C When used as a filter, Cutoff frequency = 1 / (2 pi) R C R = 1 / (2 pi) (cutoff frequency) ( C ) C = 1 / (2 pi) (cutoff frequency) ( R )
2kHz - That's the nyquist frequency at a sample frequency of 4kHz.