Power System Transients by Ametani Akihiro & Nagaoka Naoto & Baba Yoshihiro & Ohno Teruo & Yamabuki Koichi
Author:Ametani, Akihiro & Nagaoka, Naoto & Baba, Yoshihiro & Ohno, Teruo & Yamabuki, Koichi
Language: eng
Format: epub
Publisher: CRC Press
Published: 2016-11-17T16:00:00+00:00
4.2.1 Simple Switching Circuit
Figure 4.4 illustrates a logical inverter (NOT) circuit using a bipolar transistor. The source voltage VCC and the collector resistance RC are assumed to be 5 V and 4.7 kΩ, respectively.
The collector current IC becomes
If the current gain of the transistor hFE is 100, the base current should be greater than 10 µA:
An input signal is applied by a signal source with an internal impedance of 50 Ω (Rsig). The base current IB is obtained from the amplitude of the input voltage VSigout and base resistance Rb1:
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