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A microprocessor approach would be to detect the signal, calculate its frequency, and then generate the same frequency square-wave with a 90° phase-shift, which is then converted back to a sine-wave with a look-up table and an A/D.
This will give a precise phase-shift independent of frequency, with constant amplitude.
Of course that only works for a single frequency (at a time) input.

[QUOTE="crutschow, post: 1790717, member: 459376"] A microprocessor approach would be to detect the signal, calculate its frequency, and then generate the same frequency square-wave with a 90° phase-shift, which is then converted back to a sine-wave with a look-up table and an A/D. This will give a precise phase-shift independent of frequency, with constant amplitude. Of course that only works for a single frequency (at a time) input. [/QUOTE]

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