A new 246 MHz active LC band-pass filter for IF sub-sampling GSM receivers

A 246 MHz bandpass filter is implemented using a new active inductor design. The filter is implemented for a GSM IF sub-sampling receiver, however, it can be also used for dual-mode GSM-WCDMA receivers. The active inductor is implemented using on-chip capacitance and two negative transconductance differential cells. The filter is implemented as a fourth-order prototype, using narrow band approximation. The BW of the filter is 10 MHz, with automatic tuning for Q and center frequency. The design was fabricated in a 0.35 /spl mu/m CMOS process. Input 1 dB compression point equals -19 dBm. The power consumption is 33 mW for 3 V supply.

[1]  R. Meyer,et al.  Si IC-compatible inductors and LC passive filters , 1990 .

[2]  William B. Kuhn,et al.  A 200 MHz CMOS Q-enhanced LC bandpass filter , 1996 .

[3]  Anatol I. Zverev,et al.  Handbook of Filter Synthesis , 1967 .

[4]  Sherif H. K. Embabi,et al.  A 60-dB 246-MHz CMOS variable gain amplifier for subsampling GSM receivers , 2003, IEEE Trans. Very Large Scale Integr. Syst..

[5]  P. R. Gray,et al.  High-frequency CMOS continuous-time filters , 1984 .

[6]  D. Edelstein,et al.  RF circuit design aspects of spiral inductors on silicon , 1998, 1998 IEEE International Solid-State Circuits Conference. Digest of Technical Papers, ISSCC. First Edition (Cat. No.98CH36156).