Skip to Main Content
This paper presents a fully integrated dual mode Q-enhanced bandpass/notch filter front-end designed for narrowband and UWB receivers. Using a simple logic state to switch its function, the filter can provide bandpass filtering for channel selection in the NB mode or NB interference rejection in the UWB mode. A Q-enhanced circuit coupled through a transformer is used to realize the modes. Using 1.8 V supply, the filter consumes 22 mW of power and provides a 32 dB interference rejection in the UWB mode and a gain of 24 dB in the NB mode. The design occupies a die area of 1 mm2 using the mainstream 0.18 mum CMOS process.