BUTTER07

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BUTTER07-3D-FRONT.png

Features[edit]

  • Low Pass Butterworth Filter
    • 7th Order Butterworth Filter
    • Shunt first
    • 4 caps, 3 inductors
  • Bourns Inductors, 0603, CS160808 family - inexpensive
  • Can mount end launch SMT connectors or three pin headers
  • 50 Ohms in/out

Calculator (7 MHz example)[edit]

BUTTER07-LPF-Web.PNG

BUTTER07-LPF-GAIN.PNG

Parts[edit]

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 Design[edit]

BUTTER07-3D-SCHEM.png

BUTTER07-3D-FRONT.png

BUTTER07 Values[edit]

Cutoff Freq (MHz) C1/C4 (pF) C2/C3 (pF) L1/L3 (uH) L2 (uH)
1.8 820 3300 5.6 9.1
3.5 390 1600 2.7 4.7
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[edit]

CWAZ Schematic.PNG

Cutoff Freq (MHz) C1/C7 (pF) C3/C5 (pF) C4 (pF) L2/L6 (uH) L4 (uH)
1.8 1659 2631 378 5.21 4.73
3.5 853 1302 194 2.68 2.43
7 727 651 97 1.34 1.22
10.1 296 451 67 0.928 0.843
14 213 325 49 0.67 0.608
18.068 165 252 38 0.519 0.471
21 142 217 32 0.446 0.406
24.89 120 183 27 0.377 0.342
28 107 163 24 0.335 0.304

Built on BUTTER07 Board[edit]

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

Butter7 Filter Vals.PNG

3D[edit]

BUTTER07-3D-BACK.png

BUTTER07-3D-OTRTH.png