A 60-dB dynamic-range CMOS sixth-order 2.4-Hz low-pass filter for medical applications

The design and implementation of a fully integrated complementary metal-oxi de-semiconductor (CMOS) sixth-order 2.4 Hz low-pass filter (LPF) for medica l applications is presented, For the implementation of large-time constants both linearized operational transconductance amplifiers with reduced trans conductance and impedance scalers schemes for grounded capacitors are emplo yed. Experimental results for the filter have shown a dynamic range (DR) of 60 dB, while the harmonic distortion components are below -50 dB, The po,v er consumption for the filter is below 10 muW, the power supply is +/-1.5 V , and the active area is 1 mm(2). The filter was fabricated in a double pol y double metal 0.8 mum CMOS process.