Passband Voltage & Transistor Cut-Off Frequency Explained

AI Thread Summary
Pass band voltage refers to the output signal strength of a filter circuit at frequencies that are allowed to pass through, compared to those that are blocked. The cut-off frequency of a transistor indicates the highest frequency at which it can effectively amplify a signal; beyond this point, amplification diminishes. A pass band filter allows a specific range of frequencies to pass, resulting in higher voltage outputs within that range. Transistor data sheets typically display a logarithmic graph where the cut-off frequency is marked by a drop in the amplification line. Understanding these concepts is crucial for effective circuit design and analysis.
amaresh92
Messages
163
Reaction score
0
can anyone tell me what is pass band voltage?what do we meant by cut off frequency of a transistor?
advanced thanks.
 
Engineering news on Phys.org
As a guess I'd say the "pass band voltage" is the output signal strength of a filter circuit at the frequency that is "passed through", as compared to frequencies that are blocked by the filter. More context would help to refine this...

"cut off frequency" usually specifies the highest frequency at which a transistor will operate. Above that it will not amplify the signal very well.
 
schip666! said:
As a guess I'd say the "pass band voltage" is the output signal strength of a filter circuit at the frequency that is "passed through", as compared to frequencies that are blocked by the filter. More context would help to refine this...

Yea, a pass band filter let's through a range of frequencies, so you would see higher voltages coming through at these frequencies.

schip666! said:
"cut off frequency" usually specifies the highest frequency at which a transistor will operate. Above that it will not amplify the signal very well.

If you look at a data sheet for a transistor it will normaly show a log graph with a line on it. Where the line begins to drop is the cut off frequency.Hope this helps.
 
Thread 'Weird near-field phenomenon I get in my EM simulation'

Thread 'Weird near-field phenomenon I get in my EM simulation'

I recently made a basic simulation of wire antennas and I am not sure if the near field in my simulation is modeled correctly. One of the things that worry me is the fact that sometimes I see in my simulation "movements" in the near field that seems to be faster than the speed of wave propagation I defined (the speed of light in the simulation). Specifically I see "nodes" of low amplitude in the E field that are quickly "emitted" from the antenna and then slow down as they approach the far...
View full post »

Thread 'EMF (Electromagnetic Field) & EHS (Electromagnetic Hyper Sensitivity)'

Hello dear reader, a brief introduction: Some 4 years ago someone started developing health related issues, apparently due to exposure to RF & ELF related frequencies and/or fields (Magnetic). This is currently becoming known as EHS. (Electromagnetic hypersensitivity is a claimed sensitivity to electromagnetic fields, to which adverse symptoms are attributed.) She experiences a deep burning sensation throughout her entire body, leaving her in pain and exhausted after a pulse has occurred...
View full post »

Similar threads

Can lasers modify the threshold voltage of power-off transistors?
Replies
6
Views
1K
Class A Amplifier Sinusoidal Input/Output Relation
Replies
3
Views
3K
NPN transistor and how it operates....
Replies
11
Views
2K
Why does a transistor in saturation act like a short circuit?
Replies
5
Views
3K
Improving Transistor Switching for High Voltage Protection Circuits
Replies
18
Views
9K
Mosfet, Mesfet vs Bipolar transistors in RF circuits
Replies
28
Views
5K
Finding the resonant frequency of this "discriminator" demod circuit.
Replies
2
Views
2K
Mexico Voltage: 460V/60Hz to 127V Explained
Replies
5
Views
9K
Sources of voltage ripple in buck converter
Replies
13
Views
3K
LTSpice functionalities regarding its Frequency Domain Analysis
Replies
18
Views
3K

Hot Threads

Recent Insights

Back
Top