A GSM/EDGE/WCDMA modulator with on-chip D/A converter for base stations

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 mm/sup 2/ in 0.35-/spl mu/m CMOS technology. Power consumption is 1.7 W at 3.3 V with 110 MHz.

[1]  Norbert J. Fliege,et al.  Complex digital oscillators and FSK modulators , 1992, IEEE Trans. Signal Process..

[2]  G. Thiele,et al.  Antenna theory and design , 1981 .

[3]  Kari Halonen,et al.  A multicarrier QAM modulator , 2000 .

[4]  H. Samueli,et al.  The design of multiplierless FIR filters for compensating D/A converter frequency response distortion , 1988 .

[5]  Kari Halonen,et al.  A multicarrier GMSK modulator , 2001, IEEE J. Sel. Areas Commun..

[6]  A. Yamaguchi,et al.  A 10 bit 80 MHz glitchless CMOS D/A converter , 1991, Proceedings of the IEEE 1991 Custom Integrated Circuits Conference.

[7]  Lars Erup,et al.  Interpolation in digital modems. II. Implementation and performance , 1993, IEEE Trans. Commun..

[8]  H. Samueli,et al.  An improved search algorithm for the design of multiplierless FIR filters with powers-of-two coefficients , 1989 .

[9]  Jack E. Volder.  The CORDIC Trigonometric Computing Technique , 1959, IRE Trans. Electron. Comput..

[10]  Kari Halonen,et al.  Preface , 2021 .

[11]  Kari Halonen,et al.  Direct Digital Synthesizers , 2001 .

[12]  Michiel Steyaert,et al.  A 10-bit 1-GSample/s Nyquist current-steering CMOS D/A converter , 2001 .

[13]  K. Halonen,et al.  A multicarrier GMSK modulator for base station , 2001, 2001 IEEE International Solid-State Circuits Conference. Digest of Technical Papers. ISSCC (Cat. No.01CH37177).

[14]  C. W. Farrow,et al.  A continuously variable digital delay element , 1988, 1988., IEEE International Symposium on Circuits and Systems.