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Anonymous users2024-02-07The three poles of a bipolar transistor are composed of an n-type and a p-type emitter, base and collector. Because transistors have three polarities, there are also three ways to use them, namely emitter grounding (also known as co-emission amplification, CE configuration), base grounding (also known as path, the most commonly used use should belong to signal amplification, followed by impedance matching, signal conversion, ......Transistors are a very important component in circuits, and many precision components are mainly made of transistors.
The conduction of the triode is in the amplified state or the switching state depends on the DC bias added to the base of the triode, with the change of this current, the working state of the triode changes by the cut-off - linear area - saturation state change, if the triode IB (DC bias point) is fixed, the triode works in the first sex area, at this time the IC current changes only with the AC signal of the IB, the IB continues to rise, the triode enters the saturated state, at this time the IC of the triode no longer changes, the triode will work in the switching state.
The transistor works in the saturated state 1 when it is used as a switch tube, and it is not very scientific to use the amplification state 1 to indicate it.
Please refer to the IB of the transistor manual; The IC curve is used as a reference to mine to understand the working state of the transistor, and the transistor can only work normally if the BE junction and CE junction are conducted.
If the triode does not add DC bias, when the input AC sinusoidal signal is positive for half a week when amplifying the circuit, the base is positive for the emitter, because the emission junction is added with a reverse voltage, there is no base current and collector current at this time, the collector current changes are inverted with the base, in the negative half of the input voltage, the emitter potential is positive for the base potential, at this time, because the emitter is added to the positive voltage, there is a base and collector current through, and the collector current changes in phase with the base, When the transistor is not biased by DC, the BE junction and the CE junction are turned on, and the transistor amplification circuit will only have half a wave output, which will produce serious distortion.
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Anonymous users2024-02-06Here's how it works:
First of all, the power supply acts on the emission junction so that the emission junction is positively biased, and the free electrons in the emission region continue to flow to the base region, forming an emitter current.
Secondly, after the free electrons flow from the emission region to the base region, they first gather near the emission junction, but with the increase of free electrons here, an electron concentration difference is formed in the base region, so that the free electrons gradually flow from the emission junction to the collector junction in the base region, forming a collector current.
Finally, due to the large reverse voltage at the collector junction, the free electrons in the collector region are prevented from diffusing to the base region, and the free electrons gathered near the collector junction are attracted to the collector region to form the collector current.
The history of the birth of transistors.
At the time, market leaders were reluctant to embrace personal computing for the simple reason that the input-output ratio was too low, the software was not standardized, and potential users were limited by professional skills.
However, when the 8080 processor was widely used in various terminal devices, Intel's engineers began to realize the importance of personal computing and tried to convince the company's executives to start personal computing business as soon as possible. And Steve Wozniak, a genius designer who was still working at HP at the time, did the same thing – suggesting that HP start a personal computing business.
In December 1947, on the basis of the research of semiconductor experts such as Michael Faraday, Julius Lillingfeld, Boris Davidev, Russell Orr, and Carl L-Horowitz, five scientists, William Shockley, Walter Bratton, John Bardeen, Robert Gibb, and Gerald Pearson, jointly developed the industry's first transistor at Bell Labs.
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Anonymous users2024-02-051.First, the power supply acts on the emission junction so that the emission junction is positively biased, and the free electron chain in the emission region continuously flows to the base region, forming an emitter current. Second, after the free electrons flow from the emission region to the base region, the hereditary delay is concentrated near the emission junction, but with the increase of free electrons here, an electron concentration difference is formed in the base region, so that the free electrons gradually flow from the emission junction to the collector junction in the base region, forming a collector current.
2.Thirdly, due to the large reverse voltage at the collector junction, the free electrons in the collector area are prevented from diffusing to the base region, and the free electrons gathered near the collector junction are attracted to the collector region to form a collector current.
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Anonymous users2024-02-04The control pattern of the bipolar transistor is old-fashioned ().
a.The input current controls the output current.
b.The input voltage controls the output voltage.
c.The input friend closed-attitude current controls the output voltage.
d.The input voltage controls the output current.
Correct Answer: The input current controls the output current.
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Anonymous users2024-02-031. The most basic function of a crystal diode is to conduct electricity unilaterally.
2. As an indicator light, it generally refers to a light-emitting diode, for example, the hard disk light of the computer flashes to indicate that your hard disk is working.
3. The diode also has the effect of stabilizing the attitude voltage, because when the diode is turned on in the opposite direction, the current will increase instantaneously when the diode is broken down, so that when the external voltage increases, the increased current after the diode is broken down will pass through the diode and will not pass through the load connected in parallel with the diode, so as to protect the device connected in parallel.
4. Clamping function: clamping is to use diodes to maintain the voltage at both ends of the device connected to it within a range of space.
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See below how it works:
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