In this post, I would like to share with you what is dB&dBm.
dB is a ratio of the amount that represents two power (P1/P2), is a relative value, using the base-10 logarithm is multiplied by 10 to represent, as 10lg (P1/P2);
ndBmrepresents power unit, is an absolute value, related to mW, the base 10 logarithm divided 1mW expressed as 10lg (P/1mW);
Mainly based on two considerations,
1) Represent very large or very small numbers, simplifying the numbers, for example, 1000 times gain, receiver sensitivity 0.001mW, which representation of gain=30dB, -30dBm receiver sensitivity are much simple.
2) It can turn multiplication and division into addition and subtraction, by checking the number tables to handle complex calculations, great benefits to the pre-computer era.
From group: Transport&Access Network
That's all, I hope you like it.
Thank you!
