Various phase-sensitive detectors
Phase measurement

When dealing with constant-frequency signals, we can use a circuit reminiscent of a diode modulator (figure 32 a ).

The voltages V ₁ and $V_1^{\prime }$ applied to the symmetrical detector are in phase opposition. The voltage V ₂ from e ₂ is then placed in series with V ₁ and $V_1^{\prime }$...