LMV331-N, LMV339-N, LMV393-N
SNOS018G –AUGUST 1999–REVISED FEBRUARY 2013
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POSITIVE PEAK DETECTOR
Positive peak detector is basically the comparator operated as a unit gain follower with a large holding capacitor
from the output to ground. Additional transistor is added to the output to provide a low impedance current source.
When the output of the comparator goes high, current is passed through the transistor to charge up the
capacitor. The only discharge path will be the 1 MΩ resistor shunting C1 and any load that is connected to the
output. The decay time can be altered simply by changing the 1 MΩ resistor. The output should be used through
a high impedance follower to a avoid loading the output of the peak detector.
Figure 19. Positive Peak Detector
NEGATIVE PEAK DETECTOR
For the negative detector, the output transistor of the comparator acts as a low impedance current sink. The only
discharge path will be the 1 MΩ resistor and any load impedance used. Decay time is changed by varying the 1
MΩ resistor.
Figure 20. Negative Peak Detector
DRIVING CMOS AND TTL
The comparator's output is capable of driving CMOS and TTL Logic circuits.
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