Linear Integrated Circuit Phase Meter

A precision phase meter with integrated circuits is described. Important features include variable sensitivity and automatic return toward midscale when the output approaches prescribed limits. The phase meter accepts inputs with frequencies from 10 to 100 kHz and with an amplitude range from 30 mV to 3 volts rms. The operational temperature range is from 0 to 50°C. The overall phase accuracy within these conditions is about 0.5°.