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Shenke Optoelectronics / 2012-12-13

1W 30dBm = 1W

3dBm ，功率乘2倍；－ 3dBm ，功率乘1/2 1) + 3 dBm , power is doubled; -3 dBm , power is 1/2

30dBm+3dBm1W × 2=2W Example: 33dBm = 30dBm + 3dBm = 1W × 2 = 2W

30dBm3dBm1W × 1/2=0.5W www 27dBm = 30dBm - 3dBm = 1W × 1/2 = 0.5W www

10dBm ，功率乘10倍；－ 10dBm ，功率乘1/10 2) + 10dBm , power multiplied by 10 ; -10dBm , power multiplied by 1/10

30dBm+10dBm1W × 10=10W Example: 40dBm = 30dBm + 10dBm = 1W × 10 = 10W

30dBm10dBm1W × 0.1=0.1W 20dBm = 30dBm - 10dBm = 1W × 0.1 = 0.1W

44dBm=?W Example 1 : 44dBm =? W

3dBm3dBm 44dBm = 30dBm + 10dBm + 10dBm - 3dBm - 3dBm

× 10 × 10 × 1/2 × 1/2 = 1W × 10 × 10 × 1/2 × 1/2

= 25W

32dBm=?W Example 2 : 32dBm =? W

10dBm 32dBm = 30dBm + 3dBm + 3dBm + 3dBm + 3dBm - 10dBm

× 2 × 2 × 2 × 2 × 0.1 = 1W × 2 × 2 × 2 × 2 × 0.1

= 1.6W8

Calculation skills:

+2dBm的计算技巧 Calculation techniques for + 1dBm and + 2dBm

3dBm3dBm3dBm + 1dBm = + 10dBm - 3dBm - 3dBm - 3dBm

× 10 × 1/2 × 1/2 × 1/2 = X × 10 × 1/2 × 1/2 × 1/2

× 1.25w = X × 1.25w

10dBm+3dBm+3dBm+3dBm+3dBm + 2dBm =10dBm + 3dBm + 3dBm + 3dBm + 3dBm

× 0.1 × 2 × 2 × 2 × 2 = X × 0.1 × 2 × 2 × 2 × 2

× 1.6 = X × 1.6

10dBm+3dBm+3dBm+3dBm -1dBm = －10dBm + 3dBm + 3dBm + 3dBm

× 0.1 × 2 × 2 × 2 = X × 0.1 × 2 × 2 × 2

× 0.8 = X × 0.8

3dBm+1dBm －2dBm = －3dBm + 1dBm

× 1/2 × 1.25 = X × 1/2 × 1.25

× 0.625 = X × 0.625

51dBm=30dBm+10dBm+10dBm+1dBm Example 3 : 51dBm = 30dBm + 10dBm + 10dBm + 1dBm

× 10 × 10 × 1.25 = 1W × 10 × 10 × 1.25

= 125W

38dBm=30dBm+10dBm2dBm Example 4 : 38dBm = 30dBm + 10dBm - 2dBm

× 10 × 0.625 = 1W × 10 × 0.625

= 6.25W

This is all oral calculation, isn't it simple? Do you remember

W的换算, In addition: dBw and W conversion ,

dBm一样， dBw是一个表示功率绝对值的单位（也可以认为是以1W功率为基准的一个比值），计算公式为： 10log （功率值/1w ）。 dBw is the same as dBm . dBw is a unit that represents the absolute value of power (it can also be considered as a ratio based on 1W power). The calculation formula is: 10log (power value / 1w ).

dBm之间的换算关系为： 0 dBw = 10log1 W = 10log1000 mw = 30 dBm The conversion relationship between dBw and dBm is: 0 dBw = 10log1 W = 10log1000 mw = 30 dBm .

1W ，折算为dBw后为0dBwIf the power P is 1W , it is converted to dBw and then 0dBw .dBi, dBd, dBc是两个量之间的比值，表示两个量间的相对大小，而dBmdBw则是表示功率绝对大小的值。 In short, dB , dBi, dBd, and dBc are the ratios between the two quantities, indicating the relative magnitude between the two quantities, and dBm , dBw are the values representing the absolute magnitude of the power.

dBmdBw计算中，要注意基本概念，用一个dBm （或dBw ）减另外一个dBmdBw ）时，得到的结果是dB ，如： 30dBm - 0dBm = 30dBIn the calculation of dB , dBm , and dBw , pay attention to the basic concepts. When one dBm (or dBw ) is subtracted from another dBm ( dBw ), the result is dB , such as: 30dBm-0dBm = 30dB .

dBm （或dBwdBw ）之间只有加减，没有乘除。 Generally speaking, in engineering, there is only addition and subtraction between dBm and dBm (or dBw and dBw ), without multiplication and division.dBm实际上是两个功率相除， And the most used is subtraction: dBm minus dBm is actually the division of two powers,

）。 The division of signal power and noise power is the signal-to-noise ratio ( SNR ).dBm实际上是两个功率相乘。 dBm plus dBm is actually a multiplication of the two powers.

Note: The article comes from the Internet.

W, dBW and dBm conversion online calculator  P = dBW Power: P = dBm p = W

Enter the corresponding value and click "convert" to perform conversion calculation

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