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PGA204,205 - Texas Instruments
PGA204,205 - Texas Instruments

幻灯片 1 - dianyuan
幻灯片 1 - dianyuan

MAX921–MAX924 Ultra Low-Power, Single/Dual
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... and pole frequency can be tuned orthogonally via the input bias currents: the circuit description is very simple, consisting of merely one DO-CCCDTA, one voltage buffer and 2 grounded capacitors. Additionally, each function response can be selected by suitably selecting input signals in digital meth ...
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... Solid state relay (SSR) is a solid state electronic component that provides a similar function to an electromechanical relay but does not have any moving components, increasing long-term reliability. have become commercially available. The types of SSR are photo-coupled SSR, transformer-coupled SSR, ...
F5019 - Fuji Electric America
F5019 - Fuji Electric America

... products may become faulty. When using Fuji Electric semiconductor products in your equipment, you are requested to take adequate safety measures to prevent the equipment from causing a physical injury, fire, or other problem if any of the products become faulty. It is recommended to make your desig ...
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... This paper describes a monolithically integrated push-push oscillator fabricated in a production-near SiGe:C bipolar technology. The transistors used in this work show a maximum transit frequency f T = 200 GHz and a maximum frequency of oscillation f max = 275 GHz. For the passive circuitry transmis ...
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... means either a source of alternating current or voltage.   V sin wt for alternatin g voltage, V  voltage amplitude i  I sin wt for alternatin g current, I  current amplitude • In the U.S. and Canada, commercial electric-power distribution system uses a frequency of f = 60 Hz, corresponding to w ...
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MAX1736 SOT23, Single-Cell Li+ Battery Charger for Current-Limited Supply General Description

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... Considering a large capacitance of the HV cable line, and a high test voltage level, the resonant test setup is the only practical test voltage source. It can provide the required high reactive power to the examined cable, and it draws only a small active power from the supply source. Different desi ...
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... 10: CD INPUT: Use these RCA jacks to connect the output from a CD player or tape deck to the amplifier. The signal at these jacks is combined into a mono signal which is sent to the internal power amp circuit. Use the CD or tape player’s output level control to adjust the signal for the proper mix w ...
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... 130°C /W, the θJA of the minimum PWB footprint will be at least 235°C /W. This can be improved by providing a heat sink of surrounding copper ground on the PWB. Depending on the size of the copper area, the resulting θJA can range from approximately 180°C /W for one square inch to nearly 130°C /W fo ...
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... Buck-Converter, known also as Step-down Converter, is the basic part of power section in many electronic devices. It is also called Step-down Converter. Such converters are commonly used in various types of power sections of modern electronic devices, such as notebooks or smartphone ...
91526 Demonstrate understanding of electrical systems
91526 Demonstrate understanding of electrical systems

... Assessment is limited to a selection from the following: Resistors in DC Circuits Internal resistance; simple application of Kirchhoff’s Laws. Capacitors in DC Circuits Parallel plate capacitor; capacitance; dielectrics; series and parallel capacitors; charge/time, voltage/time and current/time grap ...
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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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