380 MHz low-power sharp-rejection active-RC LPF for IEEE 802.15.4a UWB WPAN

This paper describes a wide-band sharp-rejection active-RC low pass filter (LPF) for pulse-based UWB IEEE 802.15.4a WPAN applications. Sharp rejection is attributed to the combination of different AC characteristic of three biquads in series. A simple operational amplifier (Op-amp) is adopted to ensure high frequency performance for the designed filter. The LPF is designed in 0.13 mum TSMC CMOS process. The cutoff frequency is 380 MHz with about 50% of the tuning range from 300-500 MHz. The rejection is 40 dB at 600 MHz. The passband ripple is less than 1.5 dB and the filter consumes 4.6 mA from 1.2 V supply. Core chip size is 580 times 700 mum².