0.4-5.8 GHz SiGe-MMIC Quadrature Modulator Employing Self Current Controlled Mixer for Cognitive Radio

A 0.4-5.8 GHz SiGe-MMIC quadrature modulator (Q-MOD) employing a self current controlled mixer for cognitive radio is described. The self current controlled mixer consists of a Gilbert cell mixer and a self current control circuit which is composed of both a current feedback circuit and an output buffer amplifier. The self current control circuit automatically controls the mixer current according to the output power level, and improves the linearity over wide radio frequency (RF) range. Simulation results show that the proposed Q-MOD realizes 1 dB compression point (P 1 dB ) improvement of more than 3.0 dB compared to the conventional Q-MOD at the frequencies of 0.4, 0.8, 1.95, 5.2 and 5.8 GHz. The fabricated Q-MOD achieves P 1 dB improvement of more than 2.8 dB under the same condition. It also improves the output power with error vector magnitude (EVM) of 3.0% (P out @EVM=3.0%), and achieves the P out improvement of more than 2.7 dB under the modulation conditions of UHF wireless system (OFDM/16QAM, 0.4GHz), W-CDMA (HPSK/QPSK, 0.8GHz/1.95GHz) and wireless-LAN (OFDM/64QAM, 5.2GHz/5.8GHz).

[1]  Gernot Hueber,et al.  RF Front-End Architecture for Cognitive Radios , 2007, 2007 IEEE 18th International Symposium on Personal, Indoor and Mobile Radio Communications.

[2]  H. Okazaki,et al.  A 900/1500/2000-MHz triple-band reconfigurable power amplifier employing RF-MEMS switches , 2005, IEEE MTT-S International Microwave Symposium Digest, 2005..

[3]  H. Sato,et al.  A miniature 44% efficiency GaAs HBT power amplifier MMIC for the W-CDMA application , 2000, GaAs IC Symposium. IEEE Gallium Arsenide Integrated Circuits Symposium. 22nd Annual Technical Digest 2000. (Cat. No.00CH37084).

[4]  A. Holm,et al.  An adaptive multi-mode RF front-end for cellular terminals , 2008, 2008 IEEE Radio Frequency Integrated Circuits Symposium.

[5]  C. Meng,et al.  Compact 5.2-GHz GaInP/GaAs HBT Gilbert upconverter using lumped rat-race hybrid and current combiner , 2005, IEEE Microwave and Wireless Components Letters.

[6]  N. Suematsu,et al.  0.8-5.2GHz band SiGe-MMIC Q-MOD for multi-band multi-mode direct conversion transmitters , 2005, 2005 Asia-Pacific Microwave Conference Proceedings.

[7]  Liang-Hung Lu,et al.  A Wide Tuning-Range CMOS VCO With a Differential Tunable Active Inductor , 2006, IEEE Transactions on Microwave Theory and Techniques.

[8]  Chinchun Meng,et al.  5.2 GHz SiGe HBT upconverter using active-inductor LC current mirror , 2006 .

[9]  N. Suematsu,et al.  0.4-5.2GHz SiGe-MMIC Direct Conversion Mixer for Cognitive Radio Receiver , 2007, 2007 IEEE Radio and Wireless Symposium.

[10]  N. Suematsu,et al.  High linearity SiGe-MMIC Q-MOD having self mixer current control circuit with output power detector for 0.4–5.8GHz cognitive radio transceiver , 2008, 2008 IEEE Radio Frequency Integrated Circuits Symposium.

[11]  Ying-Hsi Lin,et al.  A Low-Power Fullband 802.11a/b/g WLAN Transceiver With On-Chip PA , 2007, IEEE Journal of Solid-State Circuits.

[12]  M. Zargari,et al.  A single-chip dual-band tri-mode CMOS transceiver for IEEE 802.11a/b/g wireless LAN , 2004, IEEE Journal of Solid-State Circuits.

[13]  Kenji Itoh,et al.  A dual bias-feed circuit design for SiGe HBT low-noise linear amplifier , 2003 .

[14]  Sunki Min,et al.  A Fully Integrated Direct-Conversion Receiver for CDMA and GPS Applications , 2005, IEEE Journal of Solid-State Circuits.

[15]  S. Darfeuille,et al.  Silicon-Integrated 2-GHz Fully-Differential Tunable Recursive Filter for MMIC Three-Branch Channelized Bandpass Filter Design , 2006, 2006 IEEE MTT-S International Microwave Symposium Digest.

[16]  Shintaro Shinjo,et al.  Low Quiescent Current SiGe HBT Driver Amplifier Having Self Base Bias Control Circuit , 2002 .

[17]  Yves Charon,et al.  SIC, an intracerebral radiosensitive probe for in vivo neuropharmacology investigations in small laboratory animals: theoretical considerations and practical characteristics , 2000 .