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A novel flexible pressure sensor has been successfully developed for detecting varying applied pressures. Polydimethylsiloxane (PDMS) and eutectic gallium indium (EGaIn) based liquid metal, as the conductive electrodes, were used to fabricate the sensor. The sensor was designed with four capacitors (C1, C2, C3 and C4) which were formed by overlapping the liquid metal based electrodes. The capability...
A new method for online estimation of power-stage parameters and autotuning of feedback controller for point-of-load (POL) converter is presented in this paper. The autotuning controller presented has been specifically developed to handle wide variations of the resonant frequency of LoCo output filter and the equivalent series resistance (ESR) zero of output capacitor. The resonant frequency of Lo...
This paper presents a comparison of standard topologies for AC-DC converters within micropower energy harvesting systems. The focus is on low input voltage (< 1 V), low input frequency (< a few kilohertz), ultra-low power consumption (nanowatts to microwatts), and fully integrated inductor-less cold start topologies. These standard topologies are compared in terms of PCE (power conversion efficiency),...
This paper summarizes findings on improving the efficiency of RF harvesting circuits. Following a Dickson charge pump model for RF-to-DC conversion, two RF harvesters were designed and are reported in this paper. The proposed topologies were designed and simulated on a 65nm RFCMOS process and optimized for operation at 953MHz and −20dBm input power, while providing reliable operation over a frequency...
This paper presents a designing of a low voltage energy harvesting circuits for generating rectified voltage into storage devices using vibrating piezoelectric element. A technique (i.e., DC-DC Step-Down converter) has chosen for designing the low-power circuit with low voltage energy. The proposed method consumes very little power, and is especially suitable for the environments, where ambient harvested...
Nowadays, Sensor network is extensively practical in numerous fields including general engineering, agriculture and environmental monitoring, health monitoring and surgery [1]. Sensors are designed as increasingly efficient and Miniature. As a matter of fact, the most important factor in the design of RF communications is the size of the antenna [2]. In fact, Miniaturization will be subject to steady...
For the preparation of printable devices based on ZnO nanoparticles (ZnO NP), stable colloidal dispersions of these materials are highly desirable. ZnO NP have been synthesized by chemical vapor synthesis. The particles have a spherical shape with a narrow size distribution. Stable aqueous dispersions of the ZnO NP have been successfully prepared after the addition of a polymeric stabilizer. The prepared...
A new technique and circuit topology is proposed to readout the output of a capacitive sensor for lab on chip (LOC) applications. Using time-mode signal processing and adopting modified digital blocks, a first-order delta-sigma interface is developed. It offers an incredibly compact and low-power solution where analog precision is achieved by making advantage of digital design. The design is capable...
The growing number of multi-standard and multi-application telecommunication systems has led to the development of new tunable filter topologies. Tunable filters are integral components in a variety of radar and modern multi-band communication systems [1]. The conventional tunable filters typically utilize YIG resonators, active resonators or varactors as the tuning element. However, these varactor...
This paper presents the design of a reconfigurable successive approximation analog to digital converter (ADC) for both ultra wideband and Bluetooth applications. The behavioral level design is presented along with the circuit implementation. The ADC architecture employs a split capacitor array DAC which reduces the power consumption. The ADC is implemented in a 0.18mum CMOS process and circuit level...
A novel rail-to-rail and fast continuous-time common-mode feedback (CMFB) strategy is presented proper for low-voltage Switched-OPAMP (SO) circuits. The threshold voltage change due to bulk signal is used to measure the output voltage. To satisfy speed requirements, averaging common-mode (CM) level and amplifying error signal are realized in a single block. Finally, the measured CM level is controlled...
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