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เราจะทำแบบวิศวกรผู้ยิ่งใหญ่
27. April 2024
Your valuable opinion :
LumpedBalunCalculator.php 5346 Bytes 21-12-2021 17:42:43
Lumped Element Balun Calculator
With an example of the NE/SA602/612
✈ Example : NE/SA602 • NE/SA612
From the datasheet, we know that each output (Pin 4,5) has an impedance of 1.5 kΩ.
As we use both, this adds up to 3 kΩ. Our Bandpassfilter wants to see 330 Ω for
optimal performance @ 10.7 MHz.
Keying those values into the form above, we get C1, C2 = 14.95 pF and L1, L2 = 14'799 nH. Using the closest E12 values, we would therefore use 2 x 15 pF and 2 x 15 µH.
As we do need some dc-blocking, two additional Capaitors of approx. 47 nF shall also be added at the output of the IC.
The simulated Ciruit ...
... shows good match.
Keying those values into the form above, we get C1, C2 = 14.95 pF and L1, L2 = 14'799 nH. Using the closest E12 values, we would therefore use 2 x 15 pF and 2 x 15 µH.
As we do need some dc-blocking, two additional Capaitors of approx. 47 nF shall also be added at the output of the IC.
✈ Share your thoughts
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t1 = 6498 d
t2 = 341 ms |
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