A digital quadrature modulator with on-chip D/A converter

A digital quadrature modulator is presented that can replace the first analog IF mixer stage of a base station transmitter. It interpolates orthogonal input carriers by 16 and performs digital quadrature modulation at carrier frequencies f/sub s//4, - f/sub s//4 and - f/sub s//2. A 12-bit D/A converter are integrated on-chip using segmented current source architecture and a proper switching technique to reduce spurious components and to enhance dynamic performance. The modulator is designed to fulfil the spectral, phase, and EVM specifications of GSM, EDGE and WCDMA base stations.

[1]  Randall L. Geiger,et al.  Formulation of INL and DNL yield estimation in current-steering D/A converters , 2002, 2002 IEEE International Symposium on Circuits and Systems. Proceedings (Cat. No.02CH37353).

[2]  Marko Kosunen,et al.  A GSM/EDGE/WCDMA modulator with on-chip D/A converter for base stations , 2002 .

[3]  H. Samueli,et al.  A 200-MHz all-digital QAM modulator and demodulator in 1.2- mu m CMOS for digital radio applications , 1991 .

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

[5]  Kari Halonen,et al.  A multicarrier QAM-modulator for WCDMA basestation with on-chip D/A converter , 2001, Proceedings of the IEEE 2001 Custom Integrated Circuits Conference (Cat. No.01CH37169).

[6]  Chung-Yu Wu,et al.  A low glitch 10-bit 75-MHz CMOS video D/A converter , 1995 .

[7]  S. Darlington.  On digital single-sideband modulators , 1970 .

[8]  Michel Steyaert,et al.  A 12-bit intrinsic accuracy high-speed CMOS DAC , 1998, IEEE J. Solid State Circuits.

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

[10]  W. Sansen,et al.  A 10-bit 1-GSample/s Nyquist current-steering CMOS D/A converter , 2001, Proceedings of the IEEE 2000 Custom Integrated Circuits Conference (Cat. No.00CH37044).

[11]  Michiel Steyaert,et al.  An Accurate Statistical Yield Model for CMOS Current-Steering D/A Converters , 2001 .

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

[13]  Chung-Yu Wu,et al.  A 10-b 125-MHz CMOS digital-to-analog converter (DAC) with threshold-voltage compensated current sources , 1994, IEEE J. Solid State Circuits.

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