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HMC334LP4 数据资料DataSheet下载
HMC334LP4 数据资料DataSheet下载

... DOWNCONVERTER, 0.6 - 2.7 GHz Input IP3 vs. Temperature @ LO = 0 dBm, IF = 100 MHz [1] ...
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... low-power mode and cannot enumerate USB devices. These Hi-Speed USB switches feature low 4pF (typ) on-capacitance and low 4I (typ) on-resistance. DP and DM can handle signals between 0V and 6V with any supply voltage. ...
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... systems with a nominal 3.3V or 5V supply. For differential ECL and LVECL operation, this device operates from a -3.0V to -5.5V supply. The MAX9320B is offered in industry-standard 8-pin TSSOP and SO packages. ...
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... This technique inserts an extra series connected transistor (sleep transistor) in the pull-down/pull-up path of a gate and turns it ‘off’ in the standby mode of operation [14]. During regular mode of operation, the extra transistor is turned on. This provides substantial savings in leakage current d ...
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... made by the use of simple models. The goal is to get an understanding of how SOI differs from bulk regarding the substrate coupling. The used models of the substrate are based on results achieved from the tool FEMLAB. An on-chip measurement circuit aiming at measuring SSN has been designed and imple ...
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... it is crucial that the selected method should be an online and real-time technique with low computational complexity and high accuracy (low estimation error). It is also required that the estimation method uses measured voltage, current values, and other data collected by temperature sensors and/or ...
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... General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 ...
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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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