A wide-band RF front-end with linear active notch filter for GSM inter-operability

This paper presents a wide-band RF front-end for mobile TV applications covering VHF-III(174 ~ 248MHz) and UHF band(470 ~ 746MHz). The RF front-end consists of a single to differential LNA with low amplitude/phase mismatch and an active notch filter to suppress strong GSM interferer in UHF band. The notch filter, which adopts linear active inductor and Q-enhanced structure, rejects 850/900 GSM noise by 35/37 dB, respectively. The RF front-end has 12~15dB gain and 4~5dB NF. This is fabricated on 0.18μ m CMOS technology and consumes 26.28 mW.