Timeline for Why am I measuring such high THD+N on my active high-pass filter?
Current License: CC BY-SA 4.0
11 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Sep 7, 2022 at 15:53 | vote | accept | zigzidane | ||
| Sep 7, 2022 at 0:00 | history | tweeted | twitter.com/StackElectronix/status/1567301698653143041 | ||
| Sep 3, 2022 at 10:04 | comment | added | user16324 | Look at the residual waveform (output from the AP). If it looks like harmonics, suspect the ceramics per Russell's answer. If it looks like noise bursts, suspect instability instead. | |
| Sep 3, 2022 at 1:31 | answer | added | user319836 | timeline score: 8 | |
| Sep 3, 2022 at 1:14 | comment | added | D.A.S. | You made be seeing asymmetry or slew rate limiting at large outputs causing THD, so report exact test results and settings and load capacitance | |
| Sep 3, 2022 at 0:59 | comment | added | D.A.S. | Measure THD vs Vout @ 10kHz | |
| Sep 3, 2022 at 0:57 | comment | added | Audioguru | Your highpass filters pass high frequency distortion and noise but reduce the fundamental frequency. Your 5V supply voltage is much less than the 10V recommended on the datasheet. | |
| Sep 3, 2022 at 0:56 | comment | added | D.A.S. | 12 nV / rt(Hz) @ 1kHz what do you see? | |
| Sep 2, 2022 at 23:17 | comment | added | Mattman944 | Try larger C5.. | |
| Sep 2, 2022 at 22:52 | history | edited | ocrdu | CC BY-SA 4.0 |
deleted 1 character in body; edited title
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| Sep 2, 2022 at 22:48 | history | asked | zigzidane | CC BY-SA 4.0 |