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ivs industrievertret electrical components are varactor diodes, also known as "variable reactance diodes." They are made using the characteristic that the junction capacitance of a PN junction changes with the applied voltage when reverse-biased. As the reverse bias voltage increases, the junction capacitance decreases; conversely, it increases. The capacitance of a varactor diode is generally small, with maximum values ranging from tens of pF to hundreds of pF. It is mainly used in high-frequency circuits for automatic tuning, frequency modulation, and phase adjustment, such as serving as a variable capacitor in the tuning circuit of a television receiver. The main parameters are: zero-bias junction capacitance, zero-bias quality factor, reverse breakdown voltage, center reverse bias voltage, nominal capacitance, capacitance variation range (in picofarads), and cutoff frequency.

ivs industrievertret electrical component principles

P-type semiconductors are formed by doping intrinsic semiconductors (pure, structurally complete semiconductor crystals) with small amounts of trivalent impurities, such as boron. Since boron atoms have only three valence electrons, they form covalent bonds with surrounding silicon atoms. Due to the lack of one electron, a vacancy is created in the crystal. When electrons in adjacent covalent bonds gain energy, they may fill this vacancy, turning the boron atom into an immobile negative ion, while the original silicon atom's covalent bond forms a hole due to the missing electron. However, the entire semiconductor remains electrically neutral. In this P-type semiconductor, conduction is primarily via holes, which are the majority carriers, while free electrons are the minority carriers. The principle of forming N-type semiconductors is similar to that of P-type. Pentavalent atoms, such as phosphorus, are doped into the intrinsic semiconductor. After doping, they form covalent bonds with silicon atoms, generating free electrons. In N-type semiconductors, electrons are the majority carriers, and holes are the minority carriers. Therefore, doping trivalent and pentavalent impurities into two different regions of an intrinsic semiconductor creates P-type and N-type regions. Based on the characteristics of N-type and P-type semiconductors, a concentration difference of electrons and holes appears at their interface. Electrons and holes diffuse from high-concentration regions to low-concentration regions, disrupting the electrical neutrality at the original interface. PN junction unidirectional conductivity: When a forward voltage V is applied across the PN junction, the equilibrium state of the PN junction is broken under the influence of the external electric field. Holes in the P region and electrons in the N region move toward the PN junction. Holes neutralize the negative ions in the P region of the PN junction, and electrons neutralize the positive ions in the N region of the PN junction, thereby narrowing the PN junction. As the external electric field increases, diffusion motion strengthens further, while drift motion weakens. When the applied voltage exceeds the threshold voltage, the PN junction acts like a resistor with very low resistance, meaning the PN junction is conducting.

ivs industrievertret electrical component parameters

The main characteristic parameters of quartz crystal resonators include nominal frequency, adjustment frequency deviation, temperature frequency deviation, equivalent resistance, drive level, load capacitance, shunt capacitance, aging rate, and temperature range. (1) Nominal frequency is the specified resonant center frequency of the resonator under defined conditions. (2) Adjustment frequency deviation is the maximum deviation of the operating frequency from the nominal frequency at the reference temperature under defined conditions. (3) Temperature frequency deviation is the allowable deviation of the operating frequency from the frequency at the reference temperature over the entire operating temperature range under defined conditions. (4) Reference temperature is the specified ambient temperature when measuring quartz crystal resonator parameters. For oven-controlled quartz crystal resonators, it is generally the center point of the operating temperature range. (5) Load resonance resistance is the resistance value at the load resonance frequency when the quartz crystal resonator is connected in series with a specified external capacitance. (6) Drive level refers to the effective power consumed by the quartz crystal resonator during operation; it is a measure of the excitation state applied to the quartz crystal component. In actual use, the drive level can be adjusted. Strong excitation facilitates oscillation startup, while excessively weak excitation leads to poor frequency stability or even failure to oscillate. (7) Load capacitance refers to the effective external capacitance that, together with the quartz crystal resonator, determines the load resonance frequency. Load capacitance can be appropriately adjusted according to specific conditions, allowing the resonator's operating frequency to be tuned to the nominal value. (8) Shunt capacitance refers to the static capacitance between the two pins of the quartz crystal resonator. (9) Aging rate refers to the error generated by changes in the quartz crystal over time. (10) Temperature range refers to the allowable variation range of the ambient environmental temperature during operation.

ivs industrievertret 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 differences are that the PN junction area is made as large as possible to facilitate the reception of incident light, the electrode area is made as small as possible, and the junction depth of the PN junction is very shallow, generally less than 2 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 photogenerated carriers. Under the influence 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, which changes correspondingly with variations in light. Photodiodes are widely used photosensitive devices 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 for photoelectric conversion. The text symbol in circuit diagrams is generally VD.

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