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Filter Design in Thirty Seconds. . .continued

High Pass Filter

Figure 9. High Pass Filter for ęSupplies

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Figure 10. High Pass Filter for a Single Supply

Design Procedure:

• Pick C1 = C2: __________
• Calculate R1:: ___________ (pick a standard value from Appendix A).
• Calculate R2:: __________ (pick a standard value from Appendix A).

For Single Supply Case Only:

• Calculate Cout = 100 to 1000 times C1 (not critical): __________

DONE!

Narrow (Single Frequency) Band Pass Filter
NOTE: These circuits include a gain of 10 (20 dB) at the center frequency.


Figure 11. Narrow Band Pass Filter for ęSupplies

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Figure 12. Narrow Band Pass Filter for a Single Supply

Design Procedure:

• Pick C1 = C2: __________
• Calculate R1 = R4:: ___________ (pick a standard value from Appendix A).
• Calculate R3 = 19 * R1
• Calculate R2 =

For Single Supply Case Only:

• Calculate Cin = Cout = 100 to 1000 times C1 (not critical): __________

DONE!

Figure 15. Narrow Band Pass Filter for ęSupplies

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Figure 16. Narrow Band Pass Filter for a Single Supply

Design Procedure:

• Pick C1 = C2: __________
• Calculate R3 = R4:: ___________ (pick a standard value from Appendix A).
• Calculate R1 = R2 = 20 * R3

• Calculate Cin = Cout = 100 to 1000 times C1 (not critical): __________

Figure 17. Band Reject Filter for ęSupplies

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Figure 18. Band Reject Filter for a Single Supply

Design Procedure:

• Go to section 3, and design a high pass filter for the low end of the upper band.
• Go to section 2, and design a low pass filter for the high end of the lower band.

• Calculate Cin = Cout = 100 to 1000 times C1 in the low pass filter section (not critical):__________

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