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
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can anyone tell me what is pass band voltage?what do we meant by cut off frequency of a transistor?
advanced thanks.
 
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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.
 
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