Journal
APPLIED SCIENCES-BASEL
Volume 10, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/app10010348
Keywords
reconfigurable sensor readout circuit; multimode sensing; microsensors; correlated double sampling (CDS); multi-path operational amplifier; chopper stabilization
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Funding
- NanoMaterial Technology Development Program through National Research Foundation of Korea (NRF) - Ministry of Science and ICT [NRF-2015M3A7B7045527]
- Brain Korea 21 Plus Project
- National Research Foundation of Korea [21A20151213137] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This paper presents a low-noise reconfigurable sensor readout circuit with a multimodal sensing chain for voltage/current/resistive/capacitive microsensors such that it can interface with a voltage, current, resistive, or capacitive microsensor, and can be reconfigured for a specific sensor application. The multimodal sensor readout circuit consists of a reconfigurable amplifier, programmable gain amplifier (PGA), low-pass filter (LPF), and analog-to-digital converter (ADC). A chopper stabilization technique was implemented in a multi-path operational amplifier to mitigate 1/f noise and offsets. The 1/f noise and offsets were up-converted by a chopper circuit and caused an output ripple. An AC-coupled ripple rejection loop (RRL) was implemented to reduce the output ripple caused by the chopper. When the amplifier was operated in the discrete-time mode, for example, the capacitive-sensing mode, a correlated double sampling (CDS) scheme reduced the low-frequency noise. The readout circuit was designed to use the 0.18-mu m complementary metal-oxide-semiconductor (CMOS) process with an active area of 9.61 mm(2). The total power consumption was 2.552 mW with a 1.8-V supply voltage. The measured input referred noise in the voltage-sensing mode was 5.25 mu V-rms from 1 Hz to 200 Hz.
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