LMH7220_14 Datasheet, PDF (20/34 Pages) Texas Instruments – LMH7220 High Speed Comparator with LVDS Output

LMH7220
SNOSAL3E – SEPTEMBER 2006 – REVISED MAY 2013
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mV
Vref
time
1
time
0
1
time
0
t=0
t=1
Oscillations & Noise
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.
C_C
C_P
R_p
V_REF
V_IN
R_f
+
C_P
-
Simplified Schematic
Figure 28. Simplified Schematic
20
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