Title :
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
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;
Conference_Titel :
ASIC Conference and Exhibit, 1992., Proceedings of Fifth Annual IEEE International
Conference_Location :
Rochester, NY
Print_ISBN :
0-7803-0768-2
DOI :
10.1109/ASIC.1992.270260
