7.8 Frequency Limitations of Transistors
In this section we discuss the properties of bipolar transistors under high-frequency operation. Some of the frequency limitations are junction capacitance, charging times required when excess carrier distributions are altered, and transit time of carriers across the base region. Our aim here is not to attempt a complete analysis of high-frequency operation, but rather to consider the physical basis of the most important effects. Therefore, we shall include the dominant capacitances and charging times and discuss the effects of the transit time on high-frequency devices.
7.8.1 Capacitance and Charging Times
The most obvious frequency limitation of transistors is the presence of junction capacitance at ...
Get Solid State Electronic Devices, 7th Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
