Voltage divider

In electronics, a voltage divider (also known as a potential divider) is a passive linear circuit that produces an output voltage (Vout) that is a fraction of its input voltage (Vin). Voltage division is the result of distributing the input voltage among the components of the divider. A simple example of a voltage divider is two resistors connected in series, with the input voltage applied across the resistor pair and the output voltage emerging from the connection between them. Resistor voltage dividers are commonly used to create reference voltages, or to reduce the magnitude of a voltage so it can be measured, and may also be used as signal attenuators at low frequencies. For direct current and relatively low frequencies, a voltage divider may be sufficiently accurate if made only of resistors; where frequency response over a wide range is required (such as in an oscilloscope probe), a voltage divider may have capacitive elements added to compensate load capacitance. In electric

About this result

This page is automatically generated and may contain information that is not correct, complete, up-to-date, or relevant to your search query. The same applies to every other page on this website. Please make sure to verify the information with EPFL's official sources.

Related publications (58)

Related publications

Related people (9)

Related people

Related units (10)

Related units

Related concepts (28)

Related concepts

Related courses (44)

Related courses

Related lectures (138)

Related lectures

Model-less Measurement-based Computation of Voltage Sensitivities in Unbalanced Electrical Distribution Networks

Mauro Carpita, Konstantina Christakou, Carl Emile Mugnier, Mario Paolone

Within the context of microgrids optimal voltage control, most schemes proposed in the literature either rely on (i) droop-control methods or (ii) methods involving the computation of explicit nodal power set-points as a solution to a given optimization problem. The first category of approaches is in general suboptimal as it relies on locally sensed measurements. The second category guarantees some level of optimality but requires an accurate and up-to-date model of the network that is, in general, not always available in low voltage grids. To overcome the aforementioned limitations, in this work we propose a methodology suitable for voltage control in generic low voltage 3-phase unbalanced grids. It can be used for the computation of either explicit power set-points or to define the droops of local voltage regulators. Its main characteristic is that it does not rely on the knowledge of the system model and its state. In particular, the goal is to compute linearized dependencies between voltage magnitude and nodal power injections, i.e., voltage sensitivity coefficients. The proposed method assumes availability of a monitoring infrastructure and the computation of the desired sensitivities involves the solution of an over-determined system of linear equations constructed solely using available measurements of nodal power injections and voltage magnitudes. The proposed method is also capable to account for the measurement errors and their time correlation. The performance evaluation of the proposed method is carried out using real measurements coming from a real low voltage feeder located in Switzerland equipped with an appropriate metering infrastructure.

Università degli Studi di Genova, Italy2016

Reducing Energy Dissipation in ULP Systems: PLL-Free FBAR-Based Fast Startup Transmitters

Christian Enz, David Ruffieux, Raghavasimhan Thirunarayanan

The energy dissipated by conventional phase-locked-loop-based transmitters (TXs) during the long startup phase is a major bottleneck that reduces the energy autonomy of duty-cycled ultra-low-power systems. In order to tackle this problem, this paper presents a loop-free TX based on a film-bulk acoustic wave resonator (FBAR) that has a 5-s startup time and requires just 3-s for channel switching. The presented TX takes advantage of the high-frequency stability of the FBAR digitally controlled oscillator (DCO) to operate in open loop mode. In order to avoid the problem of the same frequency stability that also hinders addressing multiple channels, the DCO output is mixed with a divided down version (which gives the IF) of itself. By adjusting the division ratio suitably, frequency of the system can then be tuned. To further relax the tuning requirements on the FBAR, the divider for producing the IF is implemented as a phase-switching divider with a step size of 0.2. Integrated in a 65-nm technology node, the TX can address all the bands within the 2.36-2.5-GHz frequency range viz. Medical body area network, industrial, scientific, and medical, and low-power active medical implant bands. Moreover, this TX is able to reach up to 16-Mb/s peak data rate while consuming 9.2 mA at 1.2 V.

Institute of Electrical and Electronics Engineers2015

Amplifier

An amplifier, electronic amplifier or (informally) amp is an electronic device that can increase the magnitude of a signal (a time-varying voltage or current). It is a two-port electronic circui

Electrical network

An electrical network is an interconnection of electrical components (e.g., batteries, resistors, inductors, capacitors, switches, transistors) or a model of such an interconnection, consisting of e

Electrical resistance and conductance

The electrical resistance of an object is a measure of its opposition to the flow of electric current. Its reciprocal quantity is , measuring the ease with which an electric current passes. Electrica

MICRO-330: Sensors

Comprendre les principes physiques utilisés dans les capteurs. Vue générale des différents principes de transduction et de l'électronique associée. Montrer des exemples d'application.

EE-361: Electrical machines (for EL)

L'objectif de ce cours est d'acquérir les connaissances de base liées aux machines électriques (conversion électromécanique). Le cours porte sur le circuit magnétique, le transformateur, les machines synchrones, asynchrones, à courant continu et les moteurs pas à pas.

EE-296: Electrical systems and electronics II

Les concepts de base permettant de comprendre et d'analyser les systèmes électroniques dédiés à l'acquisition et au traitement des signaux (signaux physiologique, bio-capteurs) seront abordés en théorie et en pratique. Cela englobe l'amplification, le filtrage et l'acquisition des ces signaux.