Abstract: A 264 MHz CMOS 4th G_m–C LPF target for the UWB standard is presented. The filter is designed by cascading two biquad cells. Compared with the previously published biquad cells, the biquad proposed here saves 1 transconductor, 3 CMFB networks and 2 capacitors. Benefiting from these merits, the power consumption and chip area of the 4th order UWB LPF are reduced dramatically without other characteristics being affected. The LPF is designed and fabricated with TSMC 0.18 μm 1P6M CMOS technology. The implemented LPF achieves a power gain of –0.5 dB. The measured frequency response matches well with that of the simulating results. The core chip area is only 0.06 mm², which has a wonderful advantage over those from similar work. The LPF excluding test-buffers dissipates a total current of 3 mA from the 1.8 V power supply.

Key words: Low pass filter (LPF), CMOS, Gm-C, Ultra-wideband (UWB).