A universal single chip analog CMOS speech processor for analog mobile cellular phones

Author

Grönroos, Mika ; Polonen, J. ; Vakiparta, P.

Author_Institution

Nokia Mobile Phones, Salo, Finland

fYear

1992

Firstpage

401

Lastpage

404

Abstract

A single-chip analog CMOS speech processor for advanced mobile-phone system (AMPS), total access communication system (TACS), NMT900, and NMT450 mobile cellular phones is represented. The circuit includes all necessary speech processing functions including compressor, expander, and deviation limiters. It includes a multi-frequency generator and buzzer driver for DTMF and general purpose signaling. The circuit is integrated in a standard 2-μm CMOS double-poly double-metal process and requires 32.8 mm²

Keywords

CMOS integrated circuits; analogue processing circuits; cellular radio; radiotelephony; speech analysis and processing; 2 micron; AMPS; DTMF; NMT450; NMT900; TACS; advanced mobile-phone system; analog CMOS speech processor; analog mobile cellular phones; buzzer driver; compressor; deviation limiters; double-poly double-metal process; expander; multi-frequency generator; signaling; total access communication system; universal single chip; Band pass filters; CMOS process; Capacitors; Cellular phones; Circuits; Frequency response; Gain; Registers; Signal generators; Speech processing;

fLanguage

English

Publisher

ieee

Conference_Titel

ASIC Conference and Exhibit, 1992., Proceedings of Fifth Annual IEEE International

Conference_Location

Rochester, NY

Print_ISBN

0-7803-0768-2

Type

conf

DOI

10.1109/ASIC.1992.270260

Filename

270260