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A monolithic dual tone multifrequency receiver

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3 Author(s)

A fully integrated DTMF receiver has been fabricated on a single CMOS chip requiring only three external passive components. The circuit combines precision filters, zero crossing detectors and amplitude detectors with digital logic. Switched capacitor techniques are used to implement high-pass, bandpass, and bandstop filters. The receiver architecture and circuit implementation are described.

Published in:

IEEE Journal of Solid-State Circuits  (Volume:14 ,  Issue: 6 )