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The design of a low noise amplifier revolves
The design of a low noise amplifier revolves

AMS4123 数据手册DataSheet 下载
AMS4123 数据手册DataSheet 下载

... 2.0V or higher it is applied to EN pin it turns on the Switching Regulator. By increasing the voltage to 2.5V or more it turns on the LDO section. Since both circuits share one single package the thermal protection turns off both circuits when the die temperature exceeds approximately 135°C. Both re ...
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... terminated at only one point. Also, a grounding method should be considered for efficient heat dissipation. Careful attention should be paid to the layout of the output, VM and GND traces, to avoid short circuits across output pins or to the power supply or ground. If such a short circuit occurs, th ...
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... A transient voltage suppression diode (commonly known as a “transorb”) is an electronic component used to protect sensitive electronics from voltage spikes induced by another source. A transorb will shunt excessive current when the voltage across the transorb exceeds a certain level. Transorbs do no ...
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... 1. Bi-Level Inputs (Low/High Level Input) with Smart Engage™ –Both a low and high level signal can be used. Be sure to lay the signal wire away from all power cables and vehicle computers. Use high quality twisted pair interconnect cables to decrease the possibility of radiated noise entering the sy ...
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... As the electric system is getting larger to meet the increasing demand for electric power, the rating of power apparatus is becoming inevitably higher in its working voltage and larger in its capacity. According to KEPCO reports, power transformers in the KEPCO system have undergone troubles such as ...
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... The main reason that the traditional class-D amplifier needs an output filter is that the switching waveform results in maximum current flow. This causes more loss in the load, which causes lower efficiency. The ripple current is large for the traditional modulation scheme because the ripple current ...
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... Full speed pull-up resistor selection input. If RSEL = 0 the internal pull-up resistor connected to D+ is disabled and an external resistor connected to VPU pin must be used. Output Enable (active-low). Enables transceiver data transmission onto the bus. When not active, the transceiver is in the re ...
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... input offset. As an example, the LTC6103 has a typical input offset of 85µV. If the minimum current is 20mA, a sense resistor of 4.25mΩ will set VSENSE to 85µV. This is the same value as the input offset. A larger sense resistor will reduce the error due to offset by increasing the sense voltage for ...
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... One implication of this last example is that resistance in wires reduces the current and power delivered to a resistor. If wire resistance is relatively large, as in a worn (or a very long) extension cord, then this loss can be signicant. If a large current is drawn, the IR drop in the wires can al ...
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... the frequency at which the input switching system can switch channels between signals. A series of steady DC voltages applied to an instrumentation amplifier in rapid succession generates a difficult composite signal to amplify. The settling time of the amplifier is the time necessary for the output ...
< 1 ... 1110 1111 1112 1113 1114 1115 1116 1117 1118 ... 2207 >

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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