Precise Differential-Phase Generator

A sinewave differential-phase standard of high accuracy and repeatability has been developed for the frequency range "zero frequency" to 200 kHz. The potential accuracy is better than (0.000 36 × F) degrees, where F is in kilohertz, throughout the range. Particular attention has been given to the purity of the output sinewave and a theoretical study has been undertaken with a view to minimizing harmonic and intermodulation distortion and at the same time optimizing the digital circuit.