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LT1187 - Low Power Video Difference Amplifier
LT1187 - Low Power Video Difference Amplifier

... Figure 1 shows a simplified schematic of the LT1187. In normal operation REF, Pin 1, is grounded or taken to a DC offset control voltage and differential signals are applied between Pins 2 and 3. The input responds linearly until all of the 345µA current flows through the 1.1k resistor and Q1 (or Q2) ...
AAT4670 数据资料DataSheet下载
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... the die temperature to reach the internal thermal limit, both power devices are switched off until the die temperature cools to a level below the thermal limit threshold. The device will thermal cycle indefinitely until the over-current or high temperature condition is removed. Due to the high therm ...
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... topology of the power converter of the regenerative drives uses two identical bridges in the rectifier and inverter stage, connected through a dc-link bus with a small capacitor connected across it, and is usually known as a Voltage back-toback converter (Fig.1) [1-3].The Direct topology to achieve ...
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... A student has used the schematic diagram below to wire the circuit picture shown. The ammeter (A T) at the source reads 6 Amps. The reading on ammeter (A1) should be ___ Amps. When the switch is closed, everything works as it should but the reading on the ammeter (A1) is three times what it should b ...
Application Note Closed Loop Control Maximizes MAPM-030400-010C00 and MAPM-030400-060C00 Module Performance
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... consequently the gain of each transistor can vary widely, often by as much as a factor of 10:1. The variation is further exacerbated with changes in operating temperature or supply voltage. This makes it impossible to design amplifiers with any precision unless a means of overcoming the effects of t ...
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ADM560 数据手册DataSheet 下载

... the input +3.3 V level. This is done in two stages using a switched capacitor technique (see Figure 11 and Figure 12). First, the +3.3 V input supply is doubled to +6.6 V using Capacitor C1 as the charge storage element. The +6.6 V level is then inverted to generate −6.6 V using Capacitor C2 as the ...
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TMP17 数据手册DataSheet 下载

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IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE) e-ISSN: 2278-1676,p-ISSN: 2320-3331,
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LM117/LM317A/LM317 3-Terminal Adjustable Regulator General Description

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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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