Measuring phase difference

This method is capable of measuring phase between 0 to ±180°. The generated square waves A and are fed to a D flip-flop which gives an output C equal to logic 1 when input 1 leads input 2 and equal to logic 0 in case of lagging. When C = logic 0, the output of the amplifier F will be positive proportional to the average value of the output of the EX-OR. When C = logic 1, F will be negative and also proportional to by the same factor. Hence, the output of the meter is positive in case of lagging and negative for leading.
Measuring phase difference - schematic

The circuit is tested for sinusoidal inputs and indicates a linearity within 1%. Measurements are unaffected by the frequency of the inputs up to 75 kHz.

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