RiseTimeMeasurement

RiseTimeMeasurement - MEASUREMENT TIPS: RISE TIME The...

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The bandwidth-rise time relationship is a quick way to approximate a frequency-domain figure-of- merit (3-dB frequency, f3dB, bandwidth) from a time domain measurement of the 10%-to-90% rise time. BUT, there are some assumptions involved in developing this relationship that you should verify when measuring the rise time of any real circuit. SET UP INPUT To set up the measurement, use both channels of the scope and display the input and the output waveforms. WAVEFORM The input should be a square wave with a rise time much faster than the rise time of the circuit being measured (not a problem for the LM741 op-amp, but can be a problem with very high speed amplifiers). You can check this qualitatively from the scope display. FREQUENCY The frequency should be low enough that you can see the exponential response "settle" to its final value, but high enough that there isn't an extremely long time between step edges (gives an irritating scope display since you can't see the exponential at all). The exact
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RiseTimeMeasurement - MEASUREMENT TIPS: RISE TIME The...

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