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I have this RLC filter. Theoretically the center frequency is 1600 Hz and the 3 dB bandwidth 161 Hz. I built it on breadboard. I used the Picoscope 2204A together with the FRA4Picoscope software to measure these two figures. For this purpose I connected the AWG output via a 50 ohm BNC cable to the input and channel 1. The output was connected via a probe to channel 2. The center frequency turned out to be about 1530 Hz, which is close enough to the theoretical 1600 Hz. However, the bandwidth turned out to be 532 Hz, much larger than the 161 Hz of above. What causes this? The inductor has a resistance of ~19,2 ohm. If I add this to the 10 ohm I get a bandwidth of 490 Hz. Reasonably close to the 532 Hz. But shouldn't I also include the output impedance of 600 ohm of the AWG? However, if I do this, the bandwidth is much to large~ 9.8 kHz. |
1 hour, 2 minutes ago |
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