A frequency synthesizer for 10/2π kHz

A sinusoidal voltage source of frequency nominally 10/2π kHz (w = 10
⁴
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 10
³
is obtained.