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AC-DC converters are mostly used as power supplies for microelectronic systems, battery chargers, wind energy applications, electric appliances in household and dc motor drives. Switched-capacitor (SC) network based converters can be good solution to the challenges of 21st century having high voltage conversion ratio and low EMI emissions. The application of this type of converters is in microprocessor...
This paper introduces an architecture of a switched-capacitor network for Gaussian pyramid generation. Gaussian pyramids are used in modern scale- and rotation-invariant feature detectors or in visual attention. Our switched-capacitor architecture is conceived within the framework of a CMOS-3D-based vision system. As such, it is also used during the acquisition phase to perform analog storage and...
In scale-space filtering signals are represented at several scales, each conveying different details of the original signal. Every new scale is the result of a smoothing operator on a former scale. In image processing, scale-space filtering is widely used in feature extractors as the Scale-Invariant Feature Transform (SIFT) algorithm. RC networks are posed as valid scale-space generators in focal-plane...
In the transformerless photovoltaic (PV) system, the common mode ground leakage current may appear due to the galvanic connection between the PV array and the ground, which causes the safety issues and reduces the efficiency. To solve this problem, a novel inverter topology with switched capacitors is proposed in this paper. By connecting one pole of the PV cell directly to the neutral line of the...
According to the problem that D-STATCOM is difficult to promote for its high price, this paper proposes a mixing application idea of D-STATCOM and switched capacitor. As for one group of switched capacitor and D-STATCOM, a minimize loss switching strategy is presented to achieve the optimization of overall loss. And for multiple groups of switched capacitor and D-STATCOM, a cooperative control tactics...
This paper introduces a modular converter topology based on switched capacitor cells. Two types of cells are discussed in this paper. The full cell switched capacitor structure, which can be used in dc/ac inversion and the half cell structure that has applications in both dc/dc and dc/ac conversion. There are several merits to this converter topology; it has a modular structure, the capacitor count...
Switched capacitor multilevel output DC-DC converters are evaluated as panel integrated modules in a solar maximum power point tracking system. The recommended system includes a central input current-controlled ripple port inverter. Potential benefits include per panel MPPT without inter-panel communication, electrolytic capacitors or per panel magnetics. Statistical methods are used to predict average...
This paper presents a wide tuning rang mm-wave VCO (voltage controlled oscillator) fabricated in IBM 90-nm CMOS technology. The VCO can be tuned from 31.4 GHz to 42.2 GHz and utilizes a differential tuning mechanism based on varactors and switched capacitors. A switched current source is used to improve the performance of the VCO when an MIM (metal-insulated-metal) capacitor is switched in the LC...
This paper introduces an EER 90 nm CMOS experimental prototype switched capacitor power amplifier (SCPA) that achieves high output power, efficiency and linear output-power control using a switched-capacitor-based switching PA without the use of a supply modulator. While amplifying 64-QAM OFDM modulation with a 20 MHz signal bandwidth it achieves an average output power of 17.7 dBm, an average PAE...
We present the design, fabrication, and measurement of an RF MEMS switched capacitor with >; 10 W power handling at 10 GHz under hot-switching conditions while maintaining a relatively-low (<; 30 V) pull-in voltage. The device consists of separate RF and DC electrodes, which are defined underneath a temperature-stable circular beam, to result in a large spring constant above the RF electrode...
A wideband LC voltage-control oscillator (VCO) is designed based on SMIC 0.18μm CMOS process, which has wide tuning range by using the switched capacitor array, while the phase noise is reduced after using the differential inductance of high quality factor and the filter method. Simulated results show that the VCO has the tuning range of 23.3% from 2.12GHz to 2.68GHz, and the phase noise of -128.1dBc/Hz...
It is shown in this work that the Slow Switching Limit (SSL) losses in a Switched-Capacitor Voltage Regulator (SCVR) has limited validity. This important metric of SCVR performance was derived with the assumption of constant, ripple free, output voltage. However, for a typical SCVR output voltage signal with ripples, it is shown here that the actual losses are significantly less than the SSL loss...
High performance voltage and current-source inverters (VSI and CSI) are widely required in various industrial applications such as servo-motor drives, special power supplies, distributed power systems and hybrid electric vehicles. However, the traditional VSI and CSI have been seriously restricted due to their narrow obtainable output voltage range, short-through problems caused by misgating and some...
This paper describes a sampled analog architecture to compute discrete linear transforms, DXT(X=C/H/S/F), using switched capacitor blocks fed with current samples. The scheme uses matrix representation of any DXT kernel, and multiplies each column of the kernel matrix with the input samples simultaneously, using an array of current scalers. It is shown that current scalers can be used to perform multiplication,...
In this paper, two techniques aiming to improve the performance of the switched-capacitor correlated-level-shifting technique are introduced. While boosting the equivalent opamp dc gain, this technique uses three clock phases. First, a time-shifted two-phase sampling approach is introduced with the addition of another set of sampling capacitors. However, this configuration has the disadvantages of...
Capacitor-switching operations present in switched-capacitor (magnetic-less) DC-DC converters give rise to spiky capacitor and hence semiconductor devices currents. The magnitudes of these currents and hence semiconductor devices switching losses are proportional to instantaneous capacitor voltage unbalance. Capacitor switching power loss on the other hand is proportional to instantaneous voltage...
In this paper we propose a controlled cross-coupled switched-capacitor based embedded DC-DC buck converter based on non-overlapping rotational time interleaving switching scheme and frequency control regulation. Proposed converter uses low swing internal signals to control half of the switches. In addition to reduction of switching power loss, the low swing control signals help to use smaller switches...
To effectively reduce output ripple of switched-capacitor DC-DC converters which generate variable output voltages, a novel feedback control scheme is presented. The proposed scheme uses pulse density and width modulation (PDWM) to reduce the output ripple with low output voltage. The prototype chip was implemented using 65nm CMOS process. The switched-capacitor DC-DC converter has 0.2-V to 0.47-V...
A 20 kHz audio-band ADC with a single power-supply pad is implemented for a digital electret microphone. The designed low-noise preamplifier not only relaxes the ADC design requirement but also provides an excellent interface for the electret capacitor. A low power 4th-order switched-capacitor (SC) ΣΔ modulator (ΣΔM) converts the analog signal into lb digital...
Power Transmission Systems have predominantly inductive loads, so that the systems themselves must supply the reactive power consumed. The most practical and efficient way for the utility to supply the reactive power demanded is through the installation of Mechanically Switched Capacitors (MSCs), more common know as shunt capacitor banks. The installation of MSCs brings benefits concerning the reduction...
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