# Sketching output waveforms while considering slew rate

• Engineering

## Homework Statement:

Sketch the output voltage when input voltage applied to non inverting amplifier with gain 10 for a square wave input signal with peak to peak voltage ##2 V##, ##50 %## duty cycle and frequency ##1## kHz. Supply Voltage is +12 V and -12V, the op amp has slew rate 0.5 V/ microsecond and the op amp is nulled initially.

## Relevant Equations:

Time Period = 1 / Frequency

Duty Cycle = (Pulse Width *100)/ Time Period
1. Using the frequency equation I know the time period is 1 millisecond.

2. The duty cycle (50%) equation tells me that the pulse width and the amplitude is 1 V.

3. Thus the input waveform looks like this : (?)

4. As the slew rate is 0.5 volts per microsecond, the output voltage would take 4 microseconds to go from -1 V to + 1V (?)

5. Thus the output waveform for one pulse should look like :

(I converted milliseconds to microseconds)

Is this correct?

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cnh1995
Homework Helper
Gold Member
5. Thus the output waveform for one pulse should look like :
You have not considered the gain.

You have not considered the gain.
Oof! Careless of me. Other than that bit is the rest fine?

berkeman
Mentor
Oof! Careless of me. Other than that bit is the rest fine?
The horizontal axis is not to scale, even ignoring the voltage gain issue. The rise/fall times are on the order of a few us, while the period of the square wave input is on the order of a ms. Do you have any ideas for how to represent that on a plot? How would you observe this on a digital oscilloscope, for example?

JC2000 and cnh1995