The actual component values represented in bold of Figure 7-7 were obtained with the following scaling procedure:

1. First determine the frequency scaling factor (FSF) for the desired cutoff frequency. Choosing f_c at 3kHz, provides the following FSF computation:
   Equation 1. $\mathrm{F}\mathrm{S}\mathrm{F}=\mathrm{ }2\mathrm{\pi }\times 300\mathrm{k}\mathrm{H}\mathrm{z}=18.84\mathrm{k}$
2. Then divide all of the normalized capacitor values by the FSF as follows (C1' and C2': prior to impedance scaling):
   Equation 2. $\mathrm{C}\mathrm{1\text{'}}=\mathrm{ }\frac{{\mathrm{C}1}_{\mathrm{n}\mathrm{o}\mathrm{r}\mathrm{m}\mathrm{a}\mathrm{l}\mathrm{i}\mathrm{z}\mathrm{e}\mathrm{d}}}{\mathrm{F}\mathrm{S}\mathrm{F}}=\frac{0.707}{18.84\mathrm{k}}=37.93\times {10}^{-6}\mathrm{F}$
   Equation 3. $\mathrm{C}\mathrm{2\text{'}}=\mathrm{ }\frac{{\mathrm{C}1}_{\mathrm{n}\mathrm{o}\mathrm{r}\mathrm{m}\mathrm{a}\mathrm{l}\mathrm{i}\mathrm{z}\mathrm{e}\mathrm{d}}}{\mathrm{F}\mathrm{S}\mathrm{F}}=\frac{1.414}{18.84\mathrm{k}}=75.05\times {10}^{-6}\mathrm{F}$
3. Last, choose an impedance scaling factor (Z). This Z factor can be calculated from a standard value for C2. Then Z can be used to determine the remaining component values as follows:
   Equation 4. $\mathrm{Z}=\mathrm{ }\frac{\mathrm{C}\mathrm{2\text{'}}}{{\mathrm{C}2}_{\mathrm{c}\mathrm{h}\mathrm{o}\mathrm{s}\mathrm{e}\mathrm{n}}}=\frac{75.05\times {10}^{-6}\mathrm{F}}{6.8\mathrm{n}\mathrm{F}}=8.4\mathrm{k}$
   Equation 5. $\mathrm{C}1=\mathrm{ }\frac{\mathrm{C}1\mathrm{\text{'}}}{\mathrm{Z}}=\frac{37.93\times {10}^{-6}\mathrm{F}}{8.4\mathrm{k}}=4.52\mathrm{n}\mathrm{F}$
   Equation 6. $\mathrm{R}1=\mathrm{ }{\mathrm{R}1}_{\mathrm{n}\mathrm{o}\mathrm{r}\mathrm{m}\mathrm{a}\mathrm{l}\mathrm{i}\mathrm{z}\mathrm{e}\mathrm{d}}\times \mathrm{Z}=1\mathrm{\Omega }\mathrm{ }\times 8.4\mathrm{k}=8.4\mathrm{k}\mathrm{\Omega }$
   Equation 7. $\mathrm{R}2=\mathrm{ }{\mathrm{R}2}_{\mathrm{n}\mathrm{o}\mathrm{r}\mathrm{m}\mathrm{a}\mathrm{l}\mathrm{i}\mathrm{z}\mathrm{e}\mathrm{d}}\times \mathrm{Z}=1\mathrm{\Omega }\mathrm{ }\times 8.4\mathrm{k}=8.4\mathrm{k}\mathrm{\Omega }$
4. A standard value of 8.45kΩ is chosen for R1 and R2.