A reconfigurable baseband circuit applied for WiMAX low-IF receivers

This paper presents a reconfigurable baseband circuit for WiMAX low-IF receivers, including a complex filter and 2 automatic gain controllers (AGCs) for I and Q channels. Only by changing the capacitor values can the center and cutoff frequencies of the complex filter be adjusted simultaneously to realize the reconfigurability. Meanwhile, a novel one-step method to obtain fast gain settling of AGCs is proposed. The chip is fabricated in 0.13-m m CMOS technology, occupies 0.9 \times 1.3 mm2, and consumes 14.8 mW of power with a 1.2-V power supply. The measurement results show a reconfigurable bandwidth of 2 K to 3.5/5/10 MHz, a gain range of 10 to 58 dB, and a total harmonic distortion of 0.43 % to 1.66%.

A reconfigurable baseband circuit applied for WiMAX low-IF receivers

This paper presents a reconfigurable baseband circuit for WiMAX low-IF receivers, including a complex filter and 2 automatic gain controllers (AGCs) for I and Q channels. Only by changing the capacitor values can the center and cutoff frequencies of the complex filter be adjusted simultaneously to realize the reconfigurability. Meanwhile, a novel one-step method to obtain fast gain settling of AGCs is proposed. The chip is fabricated in 0.13-m m CMOS technology, occupies 0.9 \times 1.3 mm2, and consumes 14.8 mW of power with a 1.2-V power supply. The measurement results show a reconfigurable bandwidth of 2 K to 3.5/5/10 MHz, a gain range of 10 to 58 dB, and a total harmonic distortion of 0.43 % to 1.66%.

___

  • IEEE Custom Integrated Circuits Conference, pp. 393–400, 1998.
  • H. Ma, F. Yuan, S. Liu, “A low power baseband chain for CMMB application”, IEEE International Conference on Communication Systems, pp. 1466–1470, 2008.
  • J.S. Syu, C.C. Meng, Y.H. Teng, “Large improvement in image rejection of double-quadrature dual-conversion low-IF architectures”, IEEE Transactions on Microwave Theory and Techniques, Vol. 58, pp. 1703–1712, 2010.
  • S.K. Ray, K. Pawlikowski, H. Sirisena, “Handover in mobile WiMAX networks: the state of art and research issues”, IEEE Communications Surveys and Tutorials, Vol. 12, pp. 376–399, 2010. [5] IEEE Computer Society, IEEE Standard 802.16 TM-2004-Air Interface for Fixed Broadband Wireless Access Systems, New York, IEEE, 2004.
  • S.J. Yoo, Design of analog baseband circuits for wireless communication receivers, PhD, Ohio State University, Columbus, OH, USA, 2004.
  • M. Miyahara, H. Sakaguchi, N. Shimasaki, A. Matsuzawa, “A 84 mW 0.36 mm2analog baseband circuits for 60 GHz wireless transceiver in 40 nm CMOS”, IEEE Radio Frequency Integrated Circuits Symposium, pp. 495–498, 2012.
  • J.P. Alegre, B. Calvo, S. Celma, “A high-performance CMOS feedforward AGC circuit for a WLAN receiver”, IEEE Transactions on Industrial Electronics, Vol. 57, pp. 2851–2857, 2010.
  • A. Miller, J.S. Hong, “Wideband bandpass filter with reconfigurable bandwidth”, IEEE Microwave and Wireless Components Letters, Vol. 20, pp. 28–30, 2010.
  • J. Okjune, “Analog baseband processor for CMOS 5-GHz WLAN receiver”, PhD, University of Florida, Gainesville, FL, USA, 2007.
  • K. Kwon, J. Choi, Y. Hwang, “A 5.8 GHz integrated CMOS dedicated short range communication transceiver for the Korea/Japan electronic toll collection system”, IEEE Transaction on Microwave Theory and Techniques, Vol.
  • 58, pp. 2751–2763, 2010.
  • F.Y. Li, H.G. Yang, Y. Wang, “Current mode feed-forward gain control for 0.8 V CMOS hearing aid”, IEEE International Symposium on Circuits and Systems, pp. 793–796, 2011.