Title :
A GSM/EDGE/WCDMA modulator with on-chip D/A converter for base stations
Author :
Vankka, Jouko ; Ketola, Jaakko ; Sommarek, Johan ; Väänänen, Olli ; Kosunen, Marko ; Halonen, Kari A I
Author_Institution :
Electron. Circuit Design Lab., Helsinki Univ. of Technol., Finland
fDate :
10/1/2002 12:00:00 AM
Abstract :
A global system for mobile communication (GSM)/enhanced data rates for GSM evolution (EDGE)/wideband code division multiple access (WCDMA) modulator with a 14-bit on-chip digital-to-analog (D/A) converter is presented. The modulator consists of several digital signal processing building blocks, including a programmable pulse shaping filter, interpolation filters, resampler, co-ordinate rotation digital computer (CORDIC) rotator, programmable output power level controller and ramping unit, and x/sinx filter. The precompensation filter, which compensates the sinc droop above the Nyquist frequency, makes it possible to use WCDMA signal images for up-conversion. The new programmable up/down unit allows power ramping on a time-slot basis as specified for GSM, EDGE and time division duplex (TDD)-WCDMA. The multistandard modulator meets the spectral, phase and error vector magnitude (EVM) specifications. The die area of the chip is 22.09 mm2 in 0.35-μm CMOS technology. Power consumption is 1.7 W at 3.3 V with 110 MHz.
Keywords :
CMOS digital integrated circuits; cellular radio; code division multiple access; compensation; digital signal processing chips; digital-analogue conversion; interpolation; modulators; ramp generators; telecommunication computing; telecommunication standards; 0.35 micron; 1.7 W; 110 MHz; 14 bit; 3.3 V; CMOS technology; CORDIC rotator; DSP building blocks; EDGE standard; EVM specifications; GSM standard; GSM/EDGE/WCDMA modulator; WCDMA standard; base station application; digital signal processing blocks; digital-to-analog converter; error vector magnitude specifications; interpolation filters; multistandard modulator; on-chip D/A converter; onchip DAC; phase specifications; power ramping; precompensation filter; programmable output power level controller; programmable pulse shaping filter; ramping unit; resampler; spectral specifications; time division duplex; wideband CDMA; x/sinx filter; Base stations; CMOS technology; Digital filters; Digital modulation; GSM; Modulation coding; Multiaccess communication; Pulse modulation; System-on-a-chip; Wideband;
Journal_Title :
Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on
DOI :
10.1109/TCSII.2002.807268
