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IXYS electrical components refer to lightning arresters or antenna switch tubes used for overvoltage protection, which contain two or more electrodes and are filled with a certain amount of inert gas. A gas discharge tube is a gap-type lightning protection component used in the lightning protection of communication systems. Gas discharge tubes are gap-type lightning protection components that have been widely applied in the lightning protection of communication systems. Discharge tubes are commonly used in the first or first two stages of multi-stage protection circuits to discharge instantaneous lightning overcurrents and limit overvoltages. Due to the high inter-electrode insulation resistance of the discharge tube and small parasitic capacitance, they have clear advantages for lightning protection of high-frequency signal lines. The main disadvantages of the discharge tube's protection characteristics are its large discharge delay and less-than-ideal operating sensitivity, making it difficult to effectively suppress lightning waves with a steep wavefront rise rate, and there is a follow-current issue in the lightning protection of power systems. Commonly used gas discharge tubes include two-electrode and three-electrode discharge tubes, whose packaging housing materials are mostly ceramic, hence they are called ceramic discharge tubes.

IXYS electrical component characteristics

The static characteristics of a sensor refer to the relationship between the output and input quantities for static input signals. Since the input and output quantities are independent of time in this case, their relationship, i.e., the static characteristics of the sensor, can be described by an algebraic equation without time variables, or by a characteristic curve plotted with the input quantity as the abscissa and the corresponding output quantity as the ordinate. The main parameters characterizing the static characteristics of a sensor include: linearity, sensitivity, hysteresis, repeatability, drift, etc. (1) Linearity: refers to the degree to which the actual relationship curve between the sensor output and input deviates from the fitted straight line. It is defined as the ratio of the maximum deviation between the actual characteristic curve and the fitted straight line over the full scale range to the full-scale output value. (2) Sensitivity: Sensitivity is an important indicator of the static characteristics of a sensor. It is defined as the ratio of the increment in the output quantity to the corresponding increment in the input quantity that causes this increment. S is used to denote sensitivity. (3) Hysteresis: Hysteresis is the phenomenon where the input-output characteristic curves do not coincide when the sensor input changes from small to large (forward stroke) and from large to small (reverse stroke). For the same magnitude of input signal, the output signals of the sensor during the forward and reverse strokes are not equal; this difference is called the hysteresis difference. (4) Repeatability: Repeatability refers to the degree of inconsistency in the characteristic curves obtained when the sensor input undergoes continuous multiple full-scale changes in the same direction. (5) Drift: Sensor drift refers to the phenomenon where the sensor output changes over time while the input remains constant. There are two causes of drift: one is the sensor's own structural parameters; the other is the surrounding environment (such as temperature, humidity, etc.). (6) Resolution: When the sensor input increases slowly from a non-zero value, an observable change in output occurs after exceeding a certain increment; this input increment is called the sensor's resolution, i.e., the minimum input increment. (7) Threshold: When the sensor input increases slowly from zero, an observable change in output occurs after reaching a certain value; this input value is called the sensor's threshold voltage.

IXYS electrical component principles

A photodiode is a semiconductor device that converts optical signals into electrical signals. Its core part is also a PN junction. Compared with ordinary diodes, the structural difference is that to facilitate the reception of incident light, the PN junction area is made as large as possible, the electrode area as small as possible, and the junction depth of the PN junction is very shallow, generally less than 6 micrometers. Photodiodes operate under reverse voltage. Without illumination, the reverse current is very small, known as dark current. When illuminated, photons carrying energy enter the PN junction and transfer energy to bound electrons in covalent bonds, causing some electrons to break free from the covalent bonds, thereby generating electron-hole pairs, known as photo-generated carriers. Under the action of reverse voltage, they participate in drift motion, significantly increasing the reverse current; the greater the light intensity, the larger the reverse current. This characteristic is called "photoconductivity." The current generated by a photodiode under general illumination is called photocurrent. If a load is connected in the external circuit, the load receives an electrical signal, and this electrical signal changes correspondingly with the light. Photodiodes are photosensitive devices widely used in electronic circuits. Like ordinary diodes, photodiodes have a PN junction; the difference is that the photodiode housing has a transparent window to receive light irradiation, achieving photoelectric conversion. In circuit diagrams, the text symbol is generally VD.

IXYS electrical component functions

Antennas radiate radio waves and also receive radio waves. However, what the transmitter sends to the antenna via the feeder is not radio waves, nor can the receiving antenna directly send radio waves to the receiver via the feeder; an energy conversion process must occur in between. Below, we analyze the signal transmission process using radio communication equipment as an example to illustrate the energy conversion role of antennas. At the transmitting end, the modulated high-frequency oscillating current (energy) generated by the transmitter is input to the transmitting antenna via feeding equipment (the feeding equipment can directly transmit current waves or electromagnetic waves depending on frequency and form). The transmitting antenna converts high-frequency current or guided waves (energy) into radio waves—free electromagnetic waves (energy)—radiating them into the surrounding space. At the receiving end, radio waves (energy) are converted by the receiving antenna into high-frequency current or guided waves (energy), which are transmitted to the receiver via feeding equipment. From the above process, it can be seen that the antenna is not only a device for radiating and receiving radio waves but also an energy converter, serving as the interface device between the circuit and space.

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