A 0.13μm CMOS Gm-C LPF for UWB receiver

A 264 MHz 6th order Gm-C Chebyshev low-pass filter based on the leapfrog structure for direct conversion UWB receiver is presented. The universal design flow and the topology of this filter are also analyzed. Tuning capacitors digitally and tuning the common-mode reference voltage continuously can calibrate the cutoff frequency to overcome the process variation and temperature dependencies. Simulated results show that the cutoff frequency can adjust from 200 MHz to 320 MHz. The attenuation at 660 MHz and 1.3 GHz are 46 dB and 75 dB respectively, and the total harmonic distortion (THD) of the filter is -39.7 dBc for 200 mVpp differential input signal at 200 MHz. The power dissipation is 11.8 mW under 1.5 V power supply.