Reconfigurable high-order moving-average filter using inverter-based variable transconductance amplifiers

A charge sampler-based reconfigurable high-order moving-average (MA) filter designed using a temporal MA method is proposed. The proposed filter has a higher gain than conventional MA filters. Moreover, the filter supports variable sizes and orders of MA. That is, the filter has a flexible frequency response by changing not only the sampling frequency but also the MA size (N) and MA order (M) . The N and M are easily controlled by changing the clock patterns; therefore, the filter is suitable for multimode transceivers. To minimize the power consumption, inverter-based transconductance amplifiers are used. Here, our fabricated filter using a 65-nm CMOS technology supports MA (N=2,M=3) and MA (N=3,M=2) without changing the hardware.