Small-signal amplification and power amplification are dependent on the application where they are going to be applied. In most cases, the frequency range of the signal is critical to its ability to carry the information that is being transferred.
In this activity, we will explore the effects of the internal and external capacitances on the frequency response of the system. We will also discuss the advantages and disadvantages of using the amplifier’s response to eliminate unwanted noise from the system.
Before you begin, be sure you review the following resources:
In your original post, answer the following:
In your own words, explain the difference between low pass filters and high pass filters. A Common-Emitter BJT amplifier acts as what type of filter?
In your own words, explain how internal capacitance and external capacitance affects the overall filter characteristics
How does having two cut off frequencies that are the same effect the overall cut off frequency?
When you have a multi-stage amplifier, how do you determine the bandwidth of the overall frequency response of the amplifier?
Electronic Devices
10th ed.
Chapter 10
Amplifier Frequency Response
Copyright © 2018 Pearson Education, Inc. All Rights Reserved
Copyright © 2018 Pearson Education, Inc. All Rights Reserved
Electronic Devices
10th ed.
? Explain how circuit capacitances affect the frequency
response of an amplifier
? Use the decibel (dB) to express amplifier gain
? Analyze the low-frequency response of an amplifier
? Analyze the high-frequency response of an amplifier
? Analyze an amplifier for total frequency response
? Analyze multistage amplifiers for frequency response
? Explain how to measure the frequency response of an amplifier
Objectives:
Copyright © 2018 Pearson Education, Inc. All Rights Reserved
Copyright © 2018 Pearson Education, Inc. All Rights Reserved
Electronic Devices
Effect of Coupling Capacitors
Coupling capacitors are in series with the signal and are part of a high-pass filter network. They affect the low-frequency response of the amplifier.
Copyright © 2018 Pearson Education, Inc. All Rights Reserved
Electronic Devices
Effect of Coupling Capacitors
Coupling capacitors are in series with the signal and are part of a high-pass filter network. They affect the low-frequency response of the amplifier.
The equivalent circuit for C1 is a high-pass filter:
Copyright © 2018 Pearson Education, Inc. All Rights Reserved
Electronic Devices
Effect of Coupling Capacitors
Coupling capacitors are in series with the signal and are part of a high-pass filter network. They affect the low-frequency response of the amplifier.
The equivalent circuit for C1 is a high-pass filter:
Copyright © 2018 Pearson Education, Inc. All Rights Reserved
Electronic Devices
Effect of Coupling Capacitors
Coupling capacitors are in series with the signal and are part of a high-pass filter network. They affect the low-frequency response of the amplifier.
The equivalent circuit for C1 is a high-pass filter:
C3 and (RC + RL) form another high-pass filter.
Copyright © 2018 Pearson Education, Inc. All Rights Reserved
Electronic Devices
Effect of Coupling Capacitors
With FETs, the input coupling capacitor is almost always smaller because of the high input resistance. The output capacitor may be smaller or larger depending on the drain and load resistor size.
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