DocumentCode
516394
Title
"Sigfred" - A Low-Power DTMF and Signalling Frequency Detector
Author
Becker, Rolf ; Mulder, Jaap
Author_Institution
Faselec AG, Zuerich, Switzerland
Volume
1
fYear
1990
fDate
19-21 Sept. 1990
Firstpage
5
Lastpage
8
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;
fLanguage
English
Publisher
ieee
Conference_Titel
Solid-State Circuits Conference, 1990. ESSCIRC '90. Sixteenth European
Conference_Location
Grenoble
Print_ISBN
2-86332-087-4
Type
conf
Filename
5468007
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