0
"3 dB" is a nickname for "1/2 power".
"1/2 power" in dB = 10 log(1/2) = 10 (-0.30103) = -3.01 dB
Wiki User
∙ 13y ago
Add your answer:
Earn +20 pts
Why cut off frequency is called half power frequency?
Cut off frequency is that frequency at which the power output of the circuit reduces to half of its power in pass band. Power (P)= Current2 X Resistance. so to reduce the power by half we need to reduce the current by 1/sqrt{2} = 0.707 = 3 db. So it's also called half power frequency. http://enter4joy.com
How gain varies with bandwidth in an op-amp?
The gain of an op amp varies with frequency. After an op amp reaches the half-power point, the gain falls appreciably. And then once it hits the transition frequency, the op amp no longer provides any gain.
Why consider only 3dB for bandwidth calculation?
3dB of gain rolloff is a linear reduction of gain by a factor of 2. That makes it a good reference point.
What happens to the power if the resistance of a circuit doubles and voltage remains the same?
the power will be reduced to the haflf because P=V2/R so when the resistance doubles the power reduced to the half of itsoriginal value
What two countries have more than half of their power from hydroelectric power?
Norway is one I guess Iceland is another.
What is -3db bandwidth?
Bandwidth is typically measured from the two -3dB points on each end of the response curve. You find the two points where the response is -3dB (half power) and measure the distance between them. That is your bandwidth.
What is negative one half to the fourth power?
Negative one half to the fourth power equals 0.0625
What is negative one-half to the negative 4 power?
Answer #1:Negative one-half to the negative 4th power, ie -((1/2)-4) equals -16Answer #2:Negative one-half to the negative 4th power, ie (-1/2)-4 equals +16
What is the value of y to the power of 2 when y equals one half?
0.25
What is a -3dB point in an inverting amplifier?
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.
What is relation between antenna gain and beamwidth?
bandwidth refers to the amount of the frequency spectrum that a signal resides in.example, the spacing between channels on radio are determined by their bandwidth. beamwidth is a physical characteristic of an antenna. they generally mark the point bore sight of a directional antenna that are at -3dB or half power
What is half of 14 equals?
Half of 14 equals 7.
What is bandwidth in LCR connection?
The bandwidth is the difference between the frequencies at which the average power dissipated is one half the maximum value or current is 1/square root(2) times its maximum value. One frequency is greater than and the other is smaller than resonant frequency and they are symmetrical about it.
Why line is drawn at 0.707 AV or 3dB to find bandwidth?
The bandwidth of a circuit, amplifier etc has been chosen to be defined by the points when the power output falls to half its maximum. Log 0.5 is -0.3 which in the decibel notation is -3dB (-0.3 Bels= -3 decibels). When the output power is at 0.5 maximum, then since the power varies as the square of the voltage, the output voltage is 0.707 of the maximum output voltage.
Half pint equals how many oz?
Half of a pint equals 8oz.
What power times one half equals one third?
It is: 2/3 times 1/2 = 1/3
Is a half cup of grapefruit equals to a half of a grapefruit?
You got it ! - Half cup of grapefruit definitely equals half cup of grapefruit
