CMOS low-power bandpass IF filter for Bluetooth

Design of a CMOS 18th-order IF (intermediate frequency) bandpass filter for integrated low-IF Bluetooth receivers is presented. The centre frequency and bandwidth of the filter are 3 and 1 MHz, respectively. The proposed filter is based on unity gain fully differential voltage buffers and provides efficient, low power and a small area design solution. The filter, including its automatic tuning circuit, occupies an area of 0.6 mm2 in a standard 0.5 µm-CMOS chip. Experimental results show that the filter satisfies the selectivity and dynamic range requirements of Bluetooth while operating from a total supply current of 0.9 mA.

[1]  Pietro Andreani,et al.  On the use of Nauta's transconductor in low-frequency CMOS g/sub m/-C bandpass filters , 2002 .

[2]  John M. Khoury,et al.  Continuous-time MOSFET-C filters in VLSI , 1986 .

[3]  H. A. Alzaher,et al.  A CMOS highly linear channel-select filter for 3G multistandard integrated wireless receivers , 2002 .

[4]  David A. Johns,et al.  Analog Integrated Circuit Design , 1996 .

[5]  T. R. Viswanathan,et al.  Switched-capacitor frequency control loop [digital transducer] , 1982 .

[6]  Edgar Sanchez-Sinencio,et al.  A pseudo differential complex filter for Bluetooth with frequency tuning , 2003, IEEE Trans. Circuits Syst. II Express Briefs.

[7]  R. Sallen,et al.  A practical method of designing RC active filters , 1955, IRE Transactions on Circuit Theory.

[8]  J. Hanson,et al.  Passive and active filters , 1987, Proceedings of the IEEE.

[9]  Chunyu Xin,et al.  A 3 V, 0.35 /spl mu/m CMOS Bluetooth receiver IC , 2002, 2002 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium. Digest of Papers (Cat. No.02CH37280).

[10]  S. Mattisson,et al.  Bluetooth-a new low-power radio interface providing short-range connectivity , 2000, Proceedings of the IEEE.

[11]  M. R. Lee,et al.  Noise characteristics of cascaded 2nd-order active filters , 1976 .

[12]  Leonard T. Bruton,et al.  Noise performance of low-sensitivity active filters , 1973 .

[13]  L. Bruton,et al.  Noise performance of RC-active quadratic filter sections , 1973 .

[14]  Hussain A. Alzaher,et al.  A CMOS bandpass filter for low-IF bluetooth receivers , 2006, IEEE Transactions on Circuits and Systems I: Regular Papers.