Abstract
Voltage divider biasing common emitter amplifier is one of the core contents in analog circuit curriculum, and almost all of traditional textbooks apply approximate calculation method to estimate all characteristic parameters. In calculating quiescent point, transistor base current is generally ignored to get the approximate base potential and emitter current, then other operating parameters, and AC small signal parameters can be acquired. The main purpose of this paper is to compare traditional and Thevenin equivalent methods and to get the difference of the two methods. A Formula is given to calculate the error of the traditional method. Example calculating reveals that the traditional method can generate an error about 10%, and even severe for small signal amplifier with higher quiescent point.
Highlights
An amplifier is one of the most important contents of electronic circuit systems
Example calculating reveals that the traditional method can generate an error about 10%, and even severe for small signal amplifier with higher quiescent point
Three questions are standing in front of us, they are: 1) If we ignore the base current as we described in method 1, what is the significant level of the effect to the quiescent point currents and voltages?
Summary
An amplifier is one of the most important contents of electronic circuit systems. The main reason is that almost all the analog signals from the sensors are very weak and could not drive loads directly. The second region is built on common and general problems [3] [4] [5] We can design or analyze the circuit from quiescent point to AC small-signal situation which means that we divide the problem into two steps. No matter which method is used, after we get the values of currents and voltages of quiescent point, we can determine the working region of the bipolar junction transistor. Three questions are standing in front of us, they are: 1) If we ignore the base current as we described in method 1, what is the significant level of the effect to the quiescent point currents and voltages?. We will give the answers for the three questions above
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