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.