| 晶体管集电结电容对放大电路的影响 |
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| 引用本文： | 曹春生,王学维.晶体管集电结电容对放大电路的影响[J].湖南师范大学自然科学学报,1987(4). |
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| 作者姓名： | 曹春生 王学维 |
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| 作者单位： | 湖南师范大学物理系
(曹春生)，湖南师范大学物理系(王学维) |
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| 摘 要： | 晶体管集电结电容C_b′c在放大电路中引入一内部反馈,阻容耦合放大时,这个内部反馈是一个电压并联负反馈,反馈系数小,可忽略不计。当放大器的负载为电感性时,通过C_b′c的反馈为电压并联正反馈,从而产生自激振荡。本文通过计算和实验两个方面加以证明。
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| 关 键 词： | 正反馈 负反馈 固有频率/自激频率 感性负载 |
EFFECTS OF THE BASE-TO-COLLECTOR JUNCTION CAPACITANCE OF A TRANSISTOR ON AMPLIFYING CIRCUITS |
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| Cao Chunsheng,Wang Xiewei.EFFECTS OF THE BASE-TO-COLLECTOR JUNCTION CAPACITANCE OF A TRANSISTOR ON AMPLIFYING CIRCUITS[J].Journal of Natural Science of Hunan Normal University,1987(4). |
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| Authors: | Cao Chunsheng Wang Xiewei |
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| Institution: | Cao Chunsheng;Wang Xiewei Department of Physics |
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| Abstract: | An internal feedback is introduced by the capacitance C_b'_c which exists betweencollector and base of a transistor in an amplifier. When the amplifier is used as arisistor-capacitor coupling amplifier, the feedback is the voltage paralleled negativeteedback. Since the feedback efficiency is very small, the feedback can beneglected. But the feedback through the cpacitance C_b'_c will be a voltageparalleled positive feedback when the load of the amplifier presents the character ofan indutance. So the self-excited oscillation will appear in the amplifier. Thisphenomenon has been proved with calculations and experiment in this essay. |
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| Keywords: | positive feedback negative feedback natural frequency/self-sustained frequency inductive load |
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