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In Reply to: RE: Phase Shift posted by Triode_Kingdom on August 02, 2017 at 09:51:26
I wasn't aware that such a situation could occur within the passband from a first order cut-off filter. Can't argue with the sim results though. Having said that, the phase shift at 10 KHz is only 2 deg which is probably less than what is imparted to the signal by the OPT at that frequency. I guess the effect could be cumulative leading to distortion and higher order harmonics at a range where the ear is sensitive.
If you don't mind, could you please post a sim with a 1 uF or 1.5 uF capacitor? Just curious to see the difference.
Follow Ups:
"the phase shift at 10 KHz is only 2 deg"
As shown in the graph, phase shift at 10 kHz is nearly 90 degrees. It won't change much with a 1u cap.
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Buy Chinese. Bury freedom.
I stand corrected, I saw the deviation from 1 KHz to 10 KHz as a 2 deg difference - which it is, not realizing that it's centered at 90 Degrees across the entire passband.
Edits: 08/02/17 08/02/17
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