A frequency synthesizer for 10/2π kHz

A sinusoidal voltage source of frequency nominally 10/2π kHz (w = 10⁴ rad/s) is derived from a 5-MHz standard. Digital counters are used to generate the required frequency, which differs from 10/2π kHz by less than 2 parts in 10^{8, and is as stable as the standard. Using a crystal filter and low-distortion amplifiers, an output of 10 V rms with total harmonic distortion less than 1 part in 103 is obtained.}