Datasheet

+
-
V
IN
C
P
C
P
C
C
R
f
R
p
Simplified Schematic
V
REF
Input Signal
fast output
Oscillations & Noise
slow output
time
time
time
t=0 t=1
0
1
0
1
mV
Vref
LMH7220
SNOSAL3E –SEPTEMBER 2006–REVISED MAY 2013 www.ti.com
Figure 27. Oscillations & Noise
In most circumstances this is not an option because the slew rate of the input signal will vary.
Using Hysteresis
A good way to avoid oscillations and noise during slow slopes is the use of hysteresis. For this purpose a
threshold is introduced that pushes the input switching level back at the moment the output switches (See
Figure 28). In this simple setup, a comparator with a single output and a resistive divider to the positive input is
drawn.
Figure 28. Simplified Schematic
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