Week #8: (10/26-30) Transistor Biasing & CE Amplifiers
Posted: Tue Oct 22, 2019 7:29 am
This week we'll continue to discuss some of the circuits investigated in the Transistor Biasing Lab from Week #7.
A key point to keep in mind during this discussion: The current gain parameter, beta (also known as hFE), generally has a wide range of values within a specific part number. For example the 2N2222 transistor may have a beta range between 50 to 300. One goal of the various biasing circuits we are discussing is to stabilized the bias point, known as the Q-point, with respect to variations in beta.
We will begin analyzing a Common Emitter Voltage Divider Biased NPN transistor amplifier for A.C. operation. The example we will work through is the one presented in our Week #8 lab experiment. Check out this link for information about the r-parameter Transistor Model.
We will also discuss some of the parameters for the 2N2222A & 2N3904 transistor spec sheets, specifically those dealing with beta (hFE on the sheet). Here are the pdfs for these two transistors:
Here are some screenshot of the WhiteBoard presentation from the 2018 Fall course:
A key point to keep in mind during this discussion: The current gain parameter, beta (also known as hFE), generally has a wide range of values within a specific part number. For example the 2N2222 transistor may have a beta range between 50 to 300. One goal of the various biasing circuits we are discussing is to stabilized the bias point, known as the Q-point, with respect to variations in beta.
We will begin analyzing a Common Emitter Voltage Divider Biased NPN transistor amplifier for A.C. operation. The example we will work through is the one presented in our Week #8 lab experiment. Check out this link for information about the r-parameter Transistor Model.
We will also discuss some of the parameters for the 2N2222A & 2N3904 transistor spec sheets, specifically those dealing with beta (hFE on the sheet). Here are the pdfs for these two transistors:
Here are some screenshot of the WhiteBoard presentation from the 2018 Fall course: