Title :
"Sigfred" - A Low-Power DTMF and Signalling Frequency Detector
Author :
Becker, Rolf ; Mulder, Jaap
Author_Institution :
Faselec AG, Zuerich, Switzerland
Abstract :
A CMOS-circuit is presented containing an analog switched-capacitor processor for detection of DTMF* and signalling tones on a telephone subscriber-line and a digital detection algorithm for postprocessing. The chip has been designed to work with low current consumption at low supply voltages and is fabricated in a standard CMOS-technology with self-aligned contacts [1] for digital circuits.
Keywords :
CMOS digital integrated circuits; subscriber loops; switched capacitor networks; telecommunication signalling; CMOS circuit; SIGFRED; analog switched-capacitor processor; digital circuit; digital detection algorithm; low supply voltage; low-power DTMF; selfaligned contact; signalling frequency detector; signalling tone; telephone subscriber line; Band pass filters; Clocks; Detectors; Frequency; Low pass filters; Low voltage; Signal detection; Signal processing; Speech; Telephony;
Conference_Titel :
Solid-State Circuits Conference, 1990. ESSCIRC '90. Sixteenth European
Conference_Location :
Grenoble
Print_ISBN :
2-86332-087-4
