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An Integrated RC Oscillator for TOUCH-TONE® Dialing

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3 Author(s)
Orr, W. ; Bell Labs., Allentown, PA ; Rickert, R. ; Hill, D.

A multiple frequency RC oscillator for use in TOUCHTONE® telephones has been made using tantalum films and beam lead silicon devices. The integrated design, equivalent to over 50 discrete components, requires a volume of about four hundredths of a cubic inch. All eight frequencies of the tone generator are initially tuned to 0.1 percent.

Published in:

Communication Technology, IEEE Transactions on  (Volume:16 ,  Issue: 4 )