To calculate the rise time of the output voltage in a zero crossing detector, we need to consider the characteristics of the op-amp and the input signal.
The rise time (tr) is the time it takes for the output voltage to rise from 10% to 90% of its final value. However, in a zero crossing detector, the output voltage switches between the positive and negative supply voltages. Therefore, we need to consider both the rising and falling edges of the output voltage.
Since the voltage swing of the output voltage is from the negative supply voltage (-Vs) to the positive supply voltage (+Vs), the total voltage change is 2Vs.
We can use the formula for rise time:
tr = Voltage Change / Slew Rate
Voltage Change = 2Vs = 2 * 10 V = 20 V
Slew Rate = 70 V/μs
tr = 20 V / 70 V/μs
= 0.286 μs
In a zero crossing detector, Calculate the rise time of the output voltage if the slew rate of op-amp is 70 V/us. Assume Vs = 10 V.
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