Transistors for beginners: Easy course for understanding transistors (Semiconductors explained ) by Tim D Maxwell

Author:Tim D Maxwell [Maxwell, Tim D]
Language: eng
Format: azw3
Published: 2017-06-07T04:00:00+00:00

(2.22)

where f α and f - the frequency at which the current gain or α decreased to 0.7 (in √2 times) its value at low frequencies ( 0 or α 0 ).

Evaluating the frequency properties of the transistor, it should also be borne in mind that the diffusion - a chaotic process. Charge carriers injected by the emitter into the base, move it in different ways. Therefore, the carriers at the same time included in the base region, reaching the collector junction at different times. Thus, the law of change of current collector may not reflect changes in the law of the emitter current, which leads to a distortion of the amplified signal. It should be emphasized quite obvious thing that is thinner than the base , the less distorted output signal, and the transistor may be at higher frequencies. Therefore, the more high-frequency transistor, the thinner it should have a base.

Classification of bipolar transistors. Commercially discrete bipolar transistors are generally classified in two ways: by power and frequency characteristics.

Power are classified into low-power ( P O 0.3 W), medium power (0.3 W < P O 1.5 W) and strong ( P O > 1.5 W); on frequency properties - for low frequency ( f α 0.3 MHz), medium frequency (0.3 MHz < f α 3 MHz), high frequency (3 MHz < f α 30 MHz) and ultrahigh frequency ( f α > 30 MHz).,

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