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This paper describes a simple control architecture realized using hybrid feedforward control for a power factor correction (PFC) rectifier based on a four-switch non-inverting buck-boost converter. The converter operates in continuous conduction mode, with smooth transitions between the buck and the boost operations across a line-cycle. To implement the PFC functionality, the controller computes the...
This paper proposes an alternate switched-capacitor amplifier capable of handling rail-to-rail input common-mode voltage without using a rail-to-rail op-amp. Unlike most existing switched-capacitor architectures, the proposed alternate architecture holds the op-amp input terminals at a fixed voltage level in both the sample and hold phases irrespective of the input signal common-mode voltage. Designed...
Energy harvesting has been widely investigated as a promising alternative for future wearable sensors or internet-of-things. However, power and performance overhead is induced when IO operations are interrupted by power failures because non-preemptive characteristic of IO operations causes expensive re-executions. Furthermore, the state-of-art IO devices need long and power hungry initializing process,...
This paper presents a miniaturized broadband dielectric spectroscopy system for dielectric characterization and chemical sensing for 1-to-8 GHz frequency range. Sensor operation is based on detecting the phase shift of a signal passing through a true-time-delay (TTD) cell at the presence of an organic chemical. Cascaded TTD cells are used to improve the detection accuracy and the sensing bandwidth...
In the article, overview and analysis of the performance of capacitive sensing circuits for MEMS gyroscopes are presented. Their performance, advantages and disadvantages are given. The low-noise chopper stabilized readout circuit for capacitive measurements in MEMS gyroscopes is proposed.
This paper proposes a novel circuit architecture and its operation style for three-level ferroelectric random access memory (FeRAM) which can improve storage density by 1.5 times compared to traditional ITIC FeRAM under same technology. A new reference voltage generation scheme is adopted to enhance the reliability of this proposed circuit architecture. Based on the results of simulation, the function...
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