A CMOS analog-digital audio processor for a portable radiotelephone

Author

Guilherme, J. ; Martins, F.P. ; Vital, João C. ; Franca, José E.

Author_Institution

Dept. of Electr. & Comput. Eng., Inst. Superior Tecnico, Lisboa, Portugal

Volume

28

Issue

5

fYear

1993

fDate

5/1/1993 12:00:00 AM

Firstpage

560

Lastpage

568

Abstract

A mixed analog-digital (A/D) integrated circuit (IC) specifically designed to realize the audio processing functions needed for a portable radiotelephone (PRT) application is described. Multirate signal processing techniques are used to reduce the capacitance spread, and hence the overall silicon area, of the chip, as well as to minimize the settling requirements of the amplifiers for lower power consumption. This, together with programmable power-saving control circuitry also incorporated on-chip, considerably extends the lifetime of the battery. A semicustom design methodology is employed to implement such an application-specific integrated circuit (ASIC) in a 3-μm CMOS double-poly processing technology. Experimental results are presented to demonstrate the correct operation and functionality of the prototype chips

Keywords

CMOS integrated circuits; mixed analogue-digital integrated circuits; radiotelephony; signal processing; telephone sets; transceivers; 3 micron; ASIC; analog-digital audio processor; application-specific integrated circuit; double-poly processing technology; integrated circuit; mixed analogue/digital IC; multirate signal processing; portable radiotelephone; programmable power-saving control circuitry; semicustom design methodology; Analog integrated circuits; Analog-digital conversion; Analog-digital integrated circuits; Application specific integrated circuits; CMOS process; CMOS technology; Capacitance; Energy consumption; Signal processing; Silicon;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.229399

Filename

229399