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Chapter: Electronic Circuits - Frequency Analysis of BJT and MOSFET Amplifiers

Rise time and its Relation to Upper Cut-off Frequency

When a step input is applied, amplifier high frequency RC network prevent the output from responding immediately to the step input.

Rise time and its Relation to Upper Cut-off Frequency:

 

Upper 3 dB Frequency:


When a step input is applied, amplifier high frequency RC network prevent the output from responding immediately to the step input. The output voltage starts from zero and rises towards the steady state value V, with a time constant R2C2 as shown in the above figure.

 

The output voltage is given by,


The time required for Vo to reach one-tenth of its final value is calculated as,


The difference between these two values is called as rise time tr of the circuit. The rise time is given as


The Upper 3dB frequency is given as,


Upper 3dB frequency in terms of rise time is given as,


From above equation, it shows that upper 3dB frequency is inversely proportional to the rise time tr.


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Electronic Circuits - Frequency Analysis of BJT and MOSFET Amplifiers : Rise time and its Relation to Upper Cut-off Frequency |


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