An integrated electronic telephone circuit

Author

Akram, M. Faheem ; Pace, W. David

Volume

18

Issue

6

fYear

1983

Firstpage

684

Lastpage

691

Abstract

An integrated electronic telephone circuit (ETC) providing all the necessary elements of a telephone station apparatus is described. The ETC includes a speech network, tone ringer, dual-tone multifrequency (DTMF) dialer and DC line interface circuit. A microprocessor port facilitates automatic dialing features under control of a separate microprocessor. The speech network and dialer circuits operate with instantaneous input voltage as low as 1.4 V. The DTMF generator incorporates a high-precision frequency synthesis technique. Because of the reduction of frequency errors, an inexpensive ceramic resonator can be used as the frequency reference for the dialer. A linear/I/SUP 2/L process with two-layer metal interconnects is used to fabricate the 125/spl times/146 mil ETC die.

Keywords

Bipolar integrated circuits; Communications computer control; Integrated injection logic; Linear integrated circuits; Telephone lines; Telephone sets; bipolar integrated circuits; communications computer control; integrated injection logic; linear integrated circuits; telephone lines; telephone sets; Automatic control; Ceramics; Circuit synthesis; Frequency synthesizers; Integrated circuit interconnections; Low voltage; Microprocessors; Network synthesis; Speech synthesis; Telephony;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/JSSC.1983.1052018

Filename

1052018