I think it is feasible to chose component values that would produce a 90 degree phase shift at a given frequency, especially if this is somewhere close to resonance, and if you are only interested in one spot frequency, this could work.?
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However, the 90 degrees shift is only likely to be present over a relatively narrow bandwidth, and the change in phase either side would probably be fairly rapid.
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Regards,
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Martin
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On Tue, Apr 22, 2025 at 09:46 PM, hisami dejima wrote:
If the coil is 10uH and the capacitance between the windings is 4pF (2x2pF), it seems to behave as it should at about 25MHz.
