A 1.8 Mu W 32 Nv/Root Hz Current-Reuse Capacitively-Coupled Instrumentation Amplifier For Eeg Detection
2017 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS (ISCAS)(2017)
Abstract
This paper presents a capacitively-coupled chopper instrumentation amplifier (CCIA) for portable EEG detection devices. In this design, the current-reuse technology is adopted in the core amplifier and the ripple reduction loop (RRL) to cut down the power consumption of the whole system. A novel ripple reduction loop based on ping-pong auto-zeroing topology is proposed to reduce the ripple at the output of the CCIA. It makes the chopping ripple be attenuated about 46 dB. This system is simulated in a 0.18 mu m CMOS process. Simulation results show that the proposed CCIA achieves an equivalent input noise power spectrum density (PSD) of 32 nV/root Hz, a noise efficiency factor (NEF) of 1.7, CMRR of 90 dB. The overall current consumption is 1.8 mu A at a 1V supply.
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Key words
capacitively-coupled chopper instrumentation amplifier, current reuse, ripple reduction loop, ping-pong auto-zeroing, noise efficiency factor
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