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Guess Paper - 2011 Class - XII Subject
Guess Paper - 2011 Class - XII Subject

Old Company Name in Catalogs and Other Documents
Old Company Name in Catalogs and Other Documents

... Notes 1. PW ≤ 10 μs, Duty Cycle ≤ 1% ...
Bulletin CW-E Clamp-on Power Meters CW120,CW121,CW240
Bulletin CW-E Clamp-on Power Meters CW120,CW121,CW240

... Quality check for power supplies used in semiconductor manufacturing equipment in accordance with the SEMI guidelines Measure stability of the voltage of supplied power according to SEMI S2-0302 (Environmental, Health, and Safety Guideline for Semiconductor Manufacturing Equipment). If a sag (defaul ...
Submittal Review Cover Sheet
Submittal Review Cover Sheet

Performance improvement of Insulator string in polluted conditions
Performance improvement of Insulator string in polluted conditions

Atom-size gaps and contacts between electrodes
Atom-size gaps and contacts between electrodes

BD768xFJ-LB series Quasi-Resonant converter Technical Design
BD768xFJ-LB series Quasi-Resonant converter Technical Design

... This application note describes the design of Quasi-Resonant converters using ROHM’s AC/DC converter IC BD768xFJ-LB series devices. It explains the selection of external components and PCB layout guidelines. ● Description The BD768xFJ-LB series are Quasi-Resonant switching AC/DC converter for drivin ...
Selector Guide
Selector Guide

RT1 - Faculty of Engineering
RT1 - Faculty of Engineering

... An important observation in Figure 21 is that as we increase the power gain of the amplifier, the required load reflection coefficient L will move towards the margin of stability. This is reasonable because as we increase the gain of an amplifier, the tendency to oscillate increases as any small am ...
DTIS Template
DTIS Template

... of Ireland, as set out in Table 1, have been submitted to and accepted by CENELEC and will appear in Annex A of the final EN 50438 document. These are deemed to apply to any micro-generation installations in Ireland. ...
High-Frequency Power Transformers
High-Frequency Power Transformers

A 6.25 Gb/s Voltage-Time Conversion Based Fractionally Spaced
A 6.25 Gb/s Voltage-Time Conversion Based Fractionally Spaced

... channel pulse response is shown in Fig. 2. To keep the derivations tractable, a 2-tap SSE and a 2-tap FSE are investigated. The FSE’s output is down-sampled by 2x, and only the pulse response observed by the slicer is studied. The same method can be extended to the study of arbitrarily long equalize ...
Design Techniques for Self Voltage Controllable Circuit on 2:1
Design Techniques for Self Voltage Controllable Circuit on 2:1

PAM3110 Description Pin Assignments
PAM3110 Description Pin Assignments

... Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein: A. Life support devices or systems are devices or systems which: ...
Model Number Structure Ordering Information
Model Number Structure Ordering Information

... The operating voltage will increase when using the H3YN continuously in any place where the ambient temperature is in a range of 45°C to 50°C. Supply 90% to 110% of the rated voltages (at 12 VDC: 95% to 110%). Do not leave the H3YN in time-up condition for a long period of time (for example, more th ...
Interfacing DAC 0800 with 8085
Interfacing DAC 0800 with 8085

UNIVERSAL DIGITAL METER • DC Volts and Amps • Thermocouples and RTDs
UNIVERSAL DIGITAL METER • DC Volts and Amps • Thermocouples and RTDs

... Model 821-10-1-RMV5 has red LED display with 8~28 VAC, 9~37 VDC power, dual 10A relay outputs, RS-232 digital interface and 660.0 VAC input range. ...
A4960: Datasheet - Allegro Microsystems
A4960: Datasheet - Allegro Microsystems

... (BLDC) motor controller for use with external N-channel power MOSFETs and is specifically designed for automotive applications. The motor is driven using block commutation (trapezoidal drive) where phase commutation is determined, without the need for independent position sensors, by monitoring the ...
FSA806 — USB2.0 High-Speed (480Mbps), UART, and Audio
FSA806 — USB2.0 High-Speed (480Mbps), UART, and Audio

as PDF
as PDF

Lecture material
Lecture material

... However, third-order products often fall within the system bandwidth and produce a distortion called third-order intercept distortion. Third-order intercept distortion is a special case of intermodulation distortion and the predominant form of frequency distortion. Third-order intermodulation compon ...
RF5924 2.4GHz TO 2.5GHz, SINGLE-BAND FRONT-END MODULE Features
RF5924 2.4GHz TO 2.5GHz, SINGLE-BAND FRONT-END MODULE Features

... the overall 802.11b/g solution. The FEM has integrated b/g power amplifier, power detector, RX balun and TX filtering. Also it is capable of switching between WiFi RX, WiFi TX, and BTH RX/TX operations. It has low insertion loss at the 2.4GHz to 2.5GHz WiFi and BTH paths. The device is manufactured ...
Transmission Gate Characteristics
Transmission Gate Characteristics

... Figure 1. Transmission Gate Circuit for Simulation. The transmissionn gate is on when en=5V and enb=0V, assuming the bulk of PMOS is connected to VDD(=5V) and the bulk of NMOS is connected to GND(=0V). In the on condition the output signal “out” will follows the input signal “in”. The operation of e ...
Click Here to Download(PPT)
Click Here to Download(PPT)

MP2607 - Monolithic Power System
MP2607 - Monolithic Power System

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Resistive opto-isolator



Resistive opto-isolator (RO), also called photoresistive opto-isolator, vactrol (after a genericized trademark introduced by Vactec, Inc. in the 1960s), analog opto-isolator or lamp-coupled photocell, is an optoelectronic device consisting of a source and detector of light, which are optically coupled and electrically isolated from each other. The light source is usually a light-emitting diode (LED), a miniature incandescent lamp, or sometimes a neon lamp, whereas the detector is a semiconductor-based photoresistor made of cadmium selenide (CdSe) or cadmium sulfide (CdS). The source and detector are coupled through a transparent glue or through the air.Electrically, RO is a resistance controlled by the current flowing through the light source. In the dark state, the resistance typically exceeds a few MOhm; when illuminated, it decreases as the inverse of the light intensity. In contrast to the photodiode and phototransistor, the photoresistor can operate in both the AC and DC circuits and have a voltage of several hundred volts across it. The harmonic distortions of the output current by the RO are typically within 0.1% at voltages below 0.5 V.RO is the first and the slowest opto-isolator: its switching time exceeds 1 ms, and for the lamp-based models can reach hundreds of milliseconds. Parasitic capacitance limits the frequency range of the photoresistor by ultrasonic frequencies. Cadmium-based photoresistors exhibit a ""memory effect"": their resistance depends on the illumination history; it also drifts during the illumination and stabilizes within hours, or even weeks for high-sensitivity models. Heating induces irreversible degradation of ROs, whereas cooling to below −25 °C dramatically increases the response time. Therefore, ROs were mostly replaced in the 1970s by the faster and more stable photodiodes and photoresistors. ROs are still used in some sound equipment, guitar amplifiers and analog synthesizers owing to their good electrical isolation, low signal distortion and ease of circuit design.
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