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| 型號(hào)： | EVAL-ADCMP603BCPZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 3/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR ADCMP603 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | * |
ADCMP603
Rev. 0 | Page 11 of 16
Q/Q OUTPUT
INPUT VOLTAGE
10V/ns
1V/ns
DISPERSION
VN ± VOS
05
91
5-
0
1
4
OPTIMIZING PERFORMANCE
As with any high speed comparator, proper design and layout
techniques are essential for obtaining the specified performance.
Stray capacitance, inductance, inductive power and ground
impedances, or other layout issues can severely limit performance
and often cause oscillation. Large discontinuities along input
and output transmission lines can also limit the specified pulse-
width dispersion performance. The source impedance should
be minimized as much as is practicable. High source impedance,
in combination with the parasitic input capacitance of the
comparator, causes an undesirable degradation in bandwidth at
the input, thus degrading the overall response. Thermal noise
from large resistances can easily cause extra jitter with slowly
slewing input signals; higher impedances encourage undesired
coupling.
Figure 16. Propagation Delay—Slew Rate Dispersion
COMPARATOR HYSTERESIS
The addition of hysteresis to a comparator is often desirable in a
noisy environment, or when the differential input amplitudes
are relatively small or slow moving. Figure 17 shows the transfer
function for a comparator with hysteresis. As the input voltage
approaches the threshold (0.0 V, in this example) from below
the threshold region in a positive direction, the comparator
switches from low to high when the input crosses +V
COMPARATOR PROPAGATION
DELAY DISPERSION
The ADCMP603 comparator is designed to reduce propagation
delay dispersion over a wide input overdrive range of 5 mV to
V
H
/2, and the
new switching threshold becomes VH/2. The comparator remains
in the high state until the new threshold, V
CCI
– 1 V. Propagation delay dispersion is the variation in
propagation delay that results from a change in the degree of
overdrive or slew rate (that is, how far or how fast the input
signal exceeds the switching threshold).
H
/2, is crossed from
below the threshold region in a negative direction. In this manner,
noise or feedback output signals centered on 0.0 V input cannot
cause the comparator to switch states unless it exceeds the region
bounded by ±VH/2.
Propagation delay dispersion is a specification that becomes
important in high speed, time-critical applications, such as data
communication, automatic test and measurement, and instru-
mentation. It is also important in event-driven applications, such
as pulse spectroscopy, nuclear instrumentation, and medical
imaging. Dispersion is defined as the variation in propagation
delay as the input overdrive conditions are changed (Figure 15
and Figure 16).
OUTPUT
INPUT
0
VOL
VOH
+VH
2
–VH
2
059
15
-01
5
ADCMP603 dispersion is typically < 2 ns as the overdrive varies
from 10 mV to 125 mV. This specification applies to both
positive and negative signals because the device has very closely
matched delays for both positive-going and negative-going
inputs.
Figure 17. Comparator Hysteresis Transfer Function
Q/Q OUTPUT
INPUT VOLTAGE
500mV OVERDRIVE
10mV OVERDRIVE
DISPERSION
VN ± VOS
05
91
5-
0
13
The customary technique for introducing hysteresis into a
comparator uses positive feedback from the output back to the
input. One limitation of this approach is that the amount of
hysteresis varies with the output logic levels, resulting in
hysteresis that is not symmetric about the threshold. The
external feedback network can also introduce significant
parasitics that reduce high speed performance and induce
oscillation in some cases.
Figure 15. Propagation Delay—Overdrive Dispersion
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