Self-Calibrated Two-Point Delta–Sigma Modulation Technique for RF Transmitters

A self-calibrated two-point delta-sigma modulation technique for CMOS RF transmitter is proposed. This calibration technique employs voltage-controlled oscillator (VCO) and delta-sigma modulator input ports in a frequency synthesizer. By monitoring the control voltage of a loop filter, the gain mismatch between two paths can be detected and completely calibrated by modifying the gain of the VCO path. The acceptable timing mismatch between the two paths is also investigated so that the timing can be controlled to ensure stable output performance. As a result, the phase modulation guarantees a robust performance against PVT variations without using any predistortion techniques. This technique is applied to a quad-band (850/900/1800/1900) GSM/EDGE transmitter for verification. For the amplitude modulation of the EDGE mode, a dc calibration is adopted to suppress unwanted carrier leakage tones. The measurement results show satisfactory GSM/EDGE spectrums and error vector magnitude performance at both low- and high-frequency bands.

[1]  Rahul Magoon,et al.  A 2.7-V 900-MHz/1.9-GHz dual-band transceiver IC for digital wireless communication , 1999 .

[2]  Tzyy-Sheng Horng,et al.  High-performance frequency-hopping transmitters using two-point delta-sigma modulation , 2004, IEEE Transactions on Microwave Theory and Techniques.

[3]  F. Murden,et al.  A polar modulator transmitter for GSM/EDGE , 2004, IEEE Journal of Solid-State Circuits.

[4]  Tser-Yu Lin,et al.  A 0.13 $\mu$ m CMOS Quad-Band GSM/GPRS/EDGE RF Transceiver Using a Low-Noise Fractional-N Frequency Synthesizer and Direct-Conversion Architecture , 2009, IEEE Journal of Solid-State Circuits.

[5]  R.B. Staszewski,et al.  Envelope and phase path recombination in ADPLL-based wideband polar transmitters , 2008, 2008 IEEE Dallas Circuits and Systems Workshop: System-on-Chip - Design, Applications, Integration, and Software.

[6]  Ping-Ying Wang,et al.  A direct digital frequency modulation PLL with all digital on-line self-calibration for quad-band GSM/GPRS transmitter , 2009, 2009 Symposium on VLSI Circuits.

[7]  Stefan Heinen,et al.  A low-IF RX two-point /spl Sigma//spl Delta/-modulation TX CMOS single-chip Bluetooth solution , 2001 .

[8]  A. Molnar,et al.  A single-chip quad-band (850/900/1800/1900 MHz) direct-conversion GSM/GPRS RF transceiver with integrated VCOs and fractional-N synthesizer , 2002, 2002 IEEE International Solid-State Circuits Conference. Digest of Technical Papers (Cat. No.02CH37315).

[9]  K. Muhammad,et al.  All-digital PLL and transmitter for mobile phones , 2005, IEEE Journal of Solid-State Circuits.

[10]  Hyung Ki Ahn,et al.  VCO gain calibration technique for GSM/EDGE polar modulated transmitter , 2008, 2008 IEEE Radio Frequency Integrated Circuits Symposium.

[11]  E. Hegazi,et al.  A 17 mW transmitter and frequency synthesizer for 900 MHz GSM fully integrated in 0.35-/spl mu/m CMOS , 2002, 2002 Symposium on VLSI Circuits. Digest of Technical Papers (Cat. No.02CH37302).

[12]  Asad A. Abidi,et al.  A 900 MHz dual conversion low-IF GSM receiver in 0.35 μm CMOS , 2001 .

[13]  Rahul Sarpeshkar,et al.  A low-power high-PSRR current-mode microphone preamplifier , 2003, IEEE J. Solid State Circuits.

[14]  A. Abidi,et al.  A 900 MHz dual conversion low-IF GSM receiver in 0.35 /spl mu/m CMOS , 2001, 2001 IEEE International Solid-State Circuits Conference. Digest of Technical Papers. ISSCC (Cat. No.01CH37177).

[15]  Bang-Sup Song,et al.  A 1.8-GHz Spur-Cancelled Fractional-N Frequency Synthesizer With LMS-Based DAC Gain Calibration , 2006, IEEE Journal of Solid-State Circuits.

[16]  T. Sowlati,et al.  Quad-band GSM/GPRS/EDGE polar loop transmitter , 2004, 2004 IEEE International Solid-State Circuits Conference (IEEE Cat. No.04CH37519).

[17]  Poras T. Balsara,et al.  Just-in-time gain estimation of an RF digitally-controlled oscillator for digital direct frequency modulation , 2003 .

[18]  Robert Bogdan Staszewski,et al.  LMS-based calibration of an RF digitally controlled oscillator for mobile phones , 2006, IEEE Transactions on Circuits and Systems II: Express Briefs.

[19]  Qiang Li,et al.  A Fully Integrated Quad-Band GPRS/EDGE Radio in 0.13μm CMOS , 2008, 2008 IEEE International Solid-State Circuits Conference - Digest of Technical Papers.

[20]  J.-M. Hsu.  A 0.18-/spl mu/m CMOS offset-PLL upconversion modulation loop IC for DCS1800 transmitter , 2003 .