An inductorless 6-Path band-pass filter with tunable center frequency for UWB applications

This paper presents an inductorless switched-capacitor 6-path band-pass filter suitable for impulse radio ultrawideband (IR-UWB) application designed in nanometer CMOS technology. The proposed wideband band-pass filter is working in discrete-time intended for power-efficient IR-UWB systems. In 90 nm CMOS we were able to design a filter with -3 dB bandwidth of 2.5 GHz and a center frequency tunable from 4.1 GHz to 4.5 GHz. Estimated power consumption is 35 mW from 1.2 V supply voltage according to post-layout simulation. A novel ring oscillator based multiphase clock is proposed, enabling center-frequency tuning at microwave frequencies.