Operation of a ring detector with an applied voltage of a distorted waveform

Summary

• 1. For the plotting of graphs of currents in a resistive load of a ring detector fed by arbitrary voltages given in an analytical or graphic form, it is recommended that formulas (3) or (4) be used.

• 2. When a ring detector is used as an FM demodulator it should be fed with an ac voltage of the same amplitude. The phase characteristic of the detector will then be more linear than if one voltage has a larger amplitude than the other.

• 3. When the ring detector is used as a phase discriminator for measuring the active component of a bridge output voltage (for instance, in a strain gauge equipment which has long leads to the transducers), the bridge should be fed from a transformer with a saturated core, or else the bridge supply voltage should be distorted by other means with odd harmonics in order to reduce the effect of unstable stray bridge capacitances on the accuracy of measurements.