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This paper presents a low-noise CMOS bandgap reference (BGR) circuit that uses two-level chopping technique to reduce errors caused by non-idealities of the OPAMP used in the design. Input referred offset voltage of the OPAMP is reduced on first level. On second level, OPAMP offset is further reduced along with the low-frequency 1/f noise caused by the input transistors of the two-stage Miller OPAMP...
This paper presents a review of energy harvesting image sensor designs in CMOS technology. Two CMOS image sensors with on-chip energy harvesting capability are presented. Quantitative comparison of power generation capacity of these two different topologies is provided. Both structures make use of the photoelectric conversion capability of the photodiode pixel array and reconfigure the array to harvest...
This paper presents a low-power maximum power point tracker (MPPT) and power management system (PM) for energy harvesting devices, including micro-photovoltaic (PV) cells, integrated in a 0.5µm 2P3M CMOS process. The MPPT utilizes the fractional open circuit method which approximates the optimal operating voltage of the PV cell as a fixed fraction of the cell's open circuit voltage. The proposed system...
This paper presents a differential amplifier design with gain enhancement using positive feedback. Comparing with the standard complementary metal-oxide-semiconductor (CMOS) differential amplifier, the new circuit has improved specifications, such as higher small-signal voltage gain, output voltage swing, and large bandwidth. In addition, the circuit has a built-in tuning capability for adjustable...
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