Difference between revisions of "BUTTER07"
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| Line 189: | Line 189: | ||
* BUTTER07 with extra capacitor for 2nd order harmonic suppression | * BUTTER07 with extra capacitor for 2nd order harmonic suppression | ||
* L2 and C5 are piggybacked | * L2 and C5 are piggybacked | ||
| + | * 9 MHz | ||
[[file:Butter7_Filter_Vals.PNG]] | [[file:Butter7_Filter_Vals.PNG]] | ||
Revision as of 16:45, 30 October 2021
Contents
Features
- 7th Order Low Pass Butterworth Filter
- Shunt first
- Bourns Inductors, 0603, CS160808 family - inexpensive
- Can mount end launch SMT connectors
- 50 Ohms in/out
Calculator (7 MHz example)
Parts
| 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
Values
| 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
- 2nd-Harmonic-Optimized LPFs by By Ed Wetherhold, W3NQN
- Other values are different from the calculator values
| 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
- BUTTER07 with extra capacitor for 2nd order harmonic suppression
- L2 and C5 are piggybacked
- 9 MHz
3D
