Title :
A baseband codec for digital cellular telephony
Author :
Lakshmikumar, Kadaba R. ; Green, David W. ; Nagaraj, Krishnaswamy ; Lau, King-Hon ; Agazzi, Oscar E. ; Barner, Jeffrey R. ; Shariatdoust, Reza S. ; Wilson, Gene A. ; Le, Tuan ; Dwarakanath, M.R. ; Ruch, Jacques G. ; Kumar, Jit ; Ali-Vehmas, Timo ; Junkkar
Author_Institution :
AT&T Bell Labs., Murray Hill, NJ, USA
fDate :
12/1/1991 12:00:00 AM
Abstract :
The authors describe the design of a baseband codec for European and North American digital cellular telephone applications. By integrating all the data conversion circuitry, this chip offers a low-cost, low-power solution to baseband signal processing and control functions. The receive section has two paths to process the in-phase and quadrature-phase components of the signal. Each path consists of a programmable gain amplifier (PGA) and a 10-b sigma-delta analog/digital (A/D) converter. Two 8-b digital/analog (D/A) converters generate the in-phase and quadrature-phase components of the transmit signal. A 9-b digital-analog converter (DAC) and a 10-b DAC are provided to perform auxiliary control functions. The chip is fabricated using a 0.9-μm CMOS technology and has an area of 21 mm2. The average power dissipation is 85 mW
Keywords :
CMOS integrated circuits; application specific integrated circuits; cellular radio; codecs; radiotelephony; 0.9 micron; 8 to 10 bit; 85 mW; CMOS; DACs; European digital cellular telephone; GSM compatible; IS-54 compatible; North American digital cellular telephone; baseband codec; baseband signal processing; chip area; control functions; data conversion circuitry integration; design; digital cellular telephony; in-phase component signal path; low-cost; low-power solution; mixed mode chips; power dissipation; programmable gain amplifier; quadrature-phase component signal path; receive section; sigma-delta ADC; Analog-digital conversion; Baseband; CMOS technology; Circuits; Codecs; Data conversion; Electronics packaging; Process control; Signal processing; Telephony;
Journal_Title :
Solid-State Circuits, IEEE Journal of
