Journal
2022 20TH IEEE INTERREGIONAL NEWCAS CONFERENCE (NEWCAS)
Volume -, Issue -, Pages 208-212Publisher
IEEE
DOI: 10.1109/NEWCAS52662.2022.9842137
Keywords
implantable device; bridge sensor; programmable gain; capacitively-coupled instrumentation amplifier (CCIA); chopping technique; ripple-reduction; energy-efficiency; low noise
Funding
- Swiss National Science Foundation (SNSF) through Sinergia Program [CRSII5 180272/1]
- Swiss National Science Foundation (SNF) [CRSII5_180272] Funding Source: Swiss National Science Foundation (SNF)
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This paper presents an energy and area efficient capacitively-coupled chopper instrumentation amplifier (CCIA) designed for implantable bridge sensor systems. Chopper stabilization is used to reduce offset and 1/f noise, and a switched-capacitor ripple reduction loop is employed to suppress the resulting ripple. The proposed CCIA, fabricated in a standard 0.18 μm CMOS process, achieves low input noise, worst-case input offset, and output ripple, making it suitable for use with various bridge sensors.
This paper presents an energy and area efficient capacitively-coupled chopper instrumentation amplifier (CCIA) dedicated to implantable bridge sensor systems. Chopper stabilization is employed to decrease its offset and 1/f noise and the resulting ripple due to the up-modulated offset and 1/f noise is suppressed by a switched-capacitor ripple reduction loop. The gain of the instrumentation amplifier is defined by a programmable capacitive feedback network with a gain range from 40 V/V to 116 V/V, which is suitable for use with bridge sensors having different output voltages. The proposed CCIA has been fabricated in a standard 0.18 mu m CMOS process. It achieves an input noise of 88.2 nV/root Hz, a worst-case input offset of 5 mu V, and an output ripple of less than 185 mu V. The CCIA occupies only 0.17 mm(2) chip area and draws 3.3 mu A current from a 1.2 V supply.
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