A High Voltage Swing Dual-Band Bandpass $\Delta\Sigma$ Modulator for Mobile Base-Station

A fully integrated high voltage swing dual-band continuous-time bandpass delta-sigma modulator (CT BPDSM) with a high voltage swing and fabricated on a 0.25 μm SiGe BiCMOS is presented. The proposed CT BPDSM consists of a two-stage second-order resonator, a high speed comparator, multi-feedback current DACs, and a high voltage swing driver. The band selection is controlled using a capacitor bank, and fine frequency tuning is conducted by a varactor. At 883 and 955 MHz, the implemented BPDSM with a high voltage swing shows a peak SNR of 40.6 and 41.9 dB, and an error vector magnitude (EVM) of 5.48%, 3.48%, respectively. In addition, it has a differential output voltage swing of 1.55 Vp-p with a dc power consumption of 635.3 mW.

[1]  A. L. Coban,et al.  Single-loop delta-sigma modulator with swing suppression , 1995 .

[2]  J.C. Scheytt,et al.  RF Bandpass Delta-Sigma Modulators for highly-efficient Class-S transmitters in SiGe BiCMOS technology , 2010, 2010 IEEE International Conference on Wireless Information Technology and Systems.

[3]  Udo Karthaus,et al.  A 900 MHz, 3.6 Gb/s bandpass DSM receiver with 55.7 dB two-tone SFDR in 1 MHz bandwidth , 2009, 2009 IEEE MTT-S International Microwave Symposium Digest.

[4]  Franco Maloberti,et al.  Optimization of the integrator output swing in low-voltage sigma-delta modulators , 2001, ISCAS 2001. The 2001 IEEE International Symposium on Circuits and Systems (Cat. No.01CH37196).

[5]  Andreas Wentzel,et al.  RF class-S power amplifiers: State-of-the-art results and potential , 2010, 2010 IEEE MTT-S International Microwave Symposium.

[6]  R. Leberer,et al.  An AlGaN/GaN class-S amplifier for RF-communication signals , 2008, 2008 IEEE MTT-S International Microwave Symposium Digest.

[7]  Shanthi Pavan,et al.  Excess Loop Delay Compensation in Continuous-Time Delta-Sigma Modulators , 2008, IEEE Transactions on Circuits and Systems II: Express Briefs.