dB.
$$ PdB = 10log_{10}\frac{P_0}{P_i}\;\;\;\;\;\; VdB = 20log_{10}\frac{V_0}{V_i}\;\;\;\;\;\;IdB = 20log_{10}\frac{I_0}{I_i} $$
배수 | 전력(dB) | 전압, 전류(dB) |
1/100 | -20[dB] | -40[dB] |
1/10 | -10[dB] | -20[dB] |
1/4 | -6[dB] | -12[dB] |
1/2 | -3[dB] | -6[dB] |
1/√2 | -1.5[dB] | -3[dB] |
1 | 0[dB] | 0[dB] |
√2 | 1.5[dB] | 3[dB] |
2 | 3[dB] | 6[dB] |
4 | 6[dB] | 12[dB] |
10 | 10[dB] | 20[dB] |
100 | 20[dB] | 40[dB] |
Laplace Analysis.
시간에 대한 함수 f(t)를 s영역의 다른 함수 F(s)로 변환하여 미분방정식의 해를 쉽게 구할 수 있도록 하는 수학 기법.
$$ L [f(t)] = F(s) = \int_{0}^{\infty}f(t)e^{-st}dt,\; \; s = \sigma + jw $$
![](https://blog.kakaocdn.net/dn/mnVTJ/btstC3ozZGC/CmpZt6As8NueWm8QiHh8d0/img.png)
![](https://blog.kakaocdn.net/dn/dLrh5I/btstCXaNyse/2JhIykqMorxsKobKssieQk/img.png)
$$ Av = \frac{1/sC}{R + 1/sC} = \frac{1}{1 +sCR}\; \; \; \; \; w\uparrow \; \; \rightarrow \; Av\downarrow $$
![](https://blog.kakaocdn.net/dn/6WHgJ/btstSBpXrsN/VXUi4XX5aI2tgeQAOOAoo0/img.png)
![](https://blog.kakaocdn.net/dn/mJKlt/btstCVD9coP/ZOQjjFAP1eKYoBEmrjMzt1/img.png)
$$ Av = \frac{sL}{R +sL} = \frac{1}{1+\frac{R}{sL}}\; \; \; \; \; w\uparrow\; \; \rightarrow \; Av\uparrow $$
Passive Filter.
RLC의 조합으로 LPF, HPF, BPF, BSF 등의 수동필터를 설계할 수 있다.
1. LPF
![](https://blog.kakaocdn.net/dn/RDBGf/btstLPhXNmF/17ODMtZbbr0FHBKjYKwB6K/img.png)
![](https://blog.kakaocdn.net/dn/pD0rD/btstC05uHCJ/kT6KDPO9IXAvDPMkmmnrnK/img.png)
![](https://blog.kakaocdn.net/dn/UJFqn/btstCViLvGD/kfkspVSCrbRfNTk0mFaTj0/img.png)
2. HPF
![](https://blog.kakaocdn.net/dn/lQnDS/btstKZMM1ye/IRJCJZcnKkK0iInIJtjdKK/img.png)
![](https://blog.kakaocdn.net/dn/YA8gs/btstRuY7TcQ/z1MOVX6GegPWUfs5bqsqo0/img.png)
![](https://blog.kakaocdn.net/dn/bPJ5pq/btstNy1W0NB/r2IupVNbmQ9mOnmsGSeXBk/img.png)
3. BPF
![](https://blog.kakaocdn.net/dn/dCNnAQ/btstCVKPLIg/S2Kx2xI2sZ4UZCLVurjK41/img.png)
![](https://blog.kakaocdn.net/dn/wuZTX/btstSyUhHGj/yUgWEeOqvKIPhIpyxP3ar0/img.png)
![](https://blog.kakaocdn.net/dn/LaEWc/btstSh6aIcf/WvzuSWp2enjAgZsyAxwqX1/img.png)
![](https://blog.kakaocdn.net/dn/bTAhpF/btstShrxkED/RgZ60kSuS2fLyxDchHe9xk/img.png)
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