A software programmable CMOS telephone circuit

Author

Dielacher, Franz ; Hauptmann, Jörg ; Reisinger, Jochen ; Steiner, Reinhard ; Zojer, Herbert

Author_Institution

Siemens-Entwicklungszentrum fuer Mikroelektronik, Villach, Austria

Volume

26

Issue

7

fYear

1991

fDate

7/1/1991 12:00:00 AM

Firstpage

1015

Lastpage

1026

Abstract

A mixed analog-digital IC combining the speech and signaling functions of an analog telephone is described. The realization in a standard 2-μm CMOS process offers the possibility of integrating complex digital functions, such as dual-tone multifrequency (DTMF) generation, in combination with many digital programmable analog circuits . Novel features, such as digital programmable level control, DC characteristics, frequency response, input impedance, and sidetone path, are implemented. These attributes offer a flexible solution for the different international requirements, with only a few external components. Software control of analog and digital functions and the high degree of integration enable telephone manufacturers to produce a quality feature phone with a minimum of components, and therefore with high reliability and low cost

Keywords

CMOS integrated circuits; digital control; telephone station equipment; 2 micron; CMOS telephone circuit; DC characteristics; DTMF generation; analog telephone; digital programmable analog circuits; digital programmable level control; dual-tone multifrequency; frequency response; input impedance; mixed analog-digital IC; sidetone path; software programmable circuit; speech/signalling functions combination; Analog circuits; Analog integrated circuits; Analog-digital conversion; Analog-digital integrated circuits; CMOS process; Frequency response; Impedance; Level control; Speech; Telephony;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.92022

Filename

92022