Switched capacitor digital phase meter

A digital frequency independent phase meter is discussed. Wide range of operation is obtained by transforming the phase to be measured into frequency within a constant range started from zero to 360 Hz. A special astable multivibrator circuit operating in this frequency range is used with a decimal counter to display the phase reading. The timing capacitor of this circuit is switched using a voltage controlled switch (VCS) operated by the phase pulses, where the free running frequency is directly related to their duty cycle. The circuit is very simple, its frequency band is wide with low cost compared with conventional circuits used for digital phase measurements. Experimental work perfectly agrees with theoretical analysis