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 0.13µm TSMC CMOS process. The cutoff frequency is 380MHz with about 50% of the tuning range from 300–500MHz. The rejection is 40 dB at 600 MHz. The passband ripple is less than 1.5dB and the filter consumes 4.6mA from 1.2V supply. Core chip size is 580 × 700µm
²
.