Title :
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
fDate :
7/1/1991 12:00:00 AM
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;
Journal_Title :
Solid-State Circuits, IEEE Journal of
