CCII-based current-mode active-RC filter with image rejection in 0.18 µm CMOS

摘要

A current-mode active-RC filter is presented in this paper. With the center frequency of 2MHz and bandwidth 1.6MHz,the filter is a 3 order complex band-pass filter. A fully differential current amplifier (FDCA) based on second-generation current conveyor (CCII) is introduced. Furthermore, programmable capacitor array and adjustable DC bias are used to help tuning the filter. The filter is designed in full custom design flow with standard SMIC 0.18μm CMOS technology. Post simulation results exhibit that the GF (gain flatness) of passing-band is within 2.5dB, IRR (image reject ratio) and ACS (adjacent channel selectivity) both exceed 35dB.