CE amplifier - How to limit bandwidth?

Click For Summary
In a common-emitter (CE) BJT amplifier configuration, placing a shunt capacitor across the collector resistor serves to limit bandwidth by affecting the amplifier's gain and impedance. Changing the collector impedance alters the amplifier's gain, as lower impedance typically increases gain while higher impedance decreases it. At high frequencies, the impedance of the shunt capacitor decreases, allowing more signal to bypass the collector resistor, thus impacting the overall frequency response. This interaction between collector impedance and capacitor behavior is crucial for controlling bandwidth in amplifier design. Understanding these dynamics is essential for optimizing amplifier performance.
sherrellbc
Messages
83
Reaction score
0
When using the CE BJT amplifier configuration, when a shunt capacitor is placed across the collector resistor, how does this act as a bandwidth limiting cap?

28i53rn.jpg
 
Last edited:
Engineering news on Phys.org
Two questions to help you answer the question yourself:

What happens to the amplifier gain when you change the collector impedance?
What happens to the impedance of C5 at high frequencies?
 
I see. Thank you very much for that. I did not think about the affect on RC and the associated gain.
 

Thread 'Electric power distribution from powerplant to homes'

I am trying to understand how transferring electric from the powerplant to my house is more effective using high voltage. The suggested explanation that the current is equal to the power supply divided by the voltage, and hence higher voltage leads to lower current and as a result to a lower power loss on the conductives is very confusing me. I know that the current is determined by the voltage and the resistance, and not by a power capability - which defines a limit to the allowable...
View full post »

Similar threads

Understand the concept of bandwidth
  • · Replies 24 ·
Replies
24
Views
3K
Heavy Amplifier Circuit Oscillation Happened
  • · Replies 3 ·
Replies
3
Views
3K
Mosfet SSR, flyback shunt/crowbar safety circuit
  • · Replies 1 ·
Replies
1
Views
2K
Understanding High-Pass Filters and CE Amplifiers
  • · Replies 14 ·
Replies
14
Views
3K
CE BJT Amplifier - Collector Resistance
  • · Replies 3 ·
Replies
3
Views
2K
Why is the non-inverting amplifier's bandwidth rating lower than expected?
  • · Replies 5 ·
Replies
5
Views
3K
Why does a buffer is used in an audio amplifier?
  • · Replies 13 ·
Replies
13
Views
10K
Understanding Bandwidth - What is it & How Does it Relate to Media?
  • · Replies 5 ·
Replies
5
Views
8K
Engineering Alternative design for a CE-CC cascade amplifier
  • · Replies 1 ·
Replies
1
Views
4K
Cellular Spectrum Bandwidth: How Much Space is Needed for a Single Call?
  • · Replies 15 ·
Replies
15
Views
2K