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A Simple Circuit for Frequency Standards Employing Overtone Crystals

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2 Author(s)
Felch, E.P. ; Bell Telephone Labs., Inc., Murray Hill, N.J. ; Israel, J.O.

A simple oscillator suitable for use as a primary standard of frequency has been developed. Employing a new quartz crystal unit operating in the fifth overtone mode at 5 megacycles, this oscillator has exhibited a frequency stability better than 1 part per billion over periods of several hours; over extended periods the frequency drifts less than 10 parts per billion per month. The oscillator comprises a single stage Class A amplifier with a pi section feedback network; this circuit minimizes the influence of variations in electron tubes and circuit components. Class A operation is accomplished by amplified automatic amplitude control that also holds the crystal dissipation to less than a microwatt. A novel feature is use of a resistor in parallel with the crystal to suppress oscillation at the fundamental and unwanted overtone frequencies, without significantly affecting the frequency stability.

Published in:

Proceedings of the IRE  (Volume:43 ,  Issue: 5 )

Date of Publication:

May 1955

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