Design and realization of large dynamic range low pass filter with wide tuneable cut-off bandwidth

A continuous-time low pass filter (LPF) for high bandwidth application is presented in this paper. The LPF is realized with 6^th order Chebyshev structure. Large dynamic range is achieved by adopting linearity enhanced technique. A 6-bit controlled switched-capacitor array is realized to get wide programmable cut-off frequency. The measurement results indicate that the -3 dB cut-off frequency can be tuned from 35 MHz to over 100 MHz. The two-tone test shows that the in-band IM3 can achieve -48 dB with 500 mV_pp input swing. This proposed filter is fabricated in TSMC 0.13 mum CMOS technology. It consumes 25 mA current with 3 V power supply and occupies 0.5 mm² area.