BUTTER07

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BUTTER07-3D-FRONT.png

Features

  • 7th Order Low Pass Butterworth Filter
  • Filter Calculator
  • Bourns Inductors, 0603, CS160808 family - inexpensive

7 MHz Example

BUTTER07-LPF-Web.PNG

BUTTER07-LPF-GAIN.PNG

Cutoff Freq (MHz) C1/C7 (pF) C3/C5 (pF) L2/L6 (uH) L4 (uH)
4 360 1500 2.4 3.9
7 200 820 1.5 2.2
14 100 390 0.68 1.1
21 68 270 0.47 0.75
28 51 200 0.36 0.56

BUTTER07-3D-SCHEM.png

  • Parts on my schematic are placeholders
  • 7 MHz (example)
    • C1 = C4 = 200pF
    • C2 = C3 = 820 pF
    • L1 = L3 = 1.5 uH
    • L2 = 2.2 uH
Cutoff Freq (MHz) C1/C4 (pF) C2/C3 (pF) L1/L3 (uH) L2 (uH)
4 360 1500 2.4 3.9
7 200 820 1.5 2.2
14 100 390 0.68 1.1
21 68 270 0.47 0.75
28 51 200 0.36 0.56


CWAZ Filter

  • BUTTER07 with extra capacitor for 2nd order harmonic suppression
  • L2 and C5 are piggybacked

Butter7 Filter Vals.PNG

3D

BUTTER07-3D-BACK.png

BUTTER07-3D-OTRTH.png

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