lmp7718mmx National Semiconductor Corporation, lmp7718mmx Datasheet - Page 20
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lmp7718mmx
Manufacturer Part Number
lmp7718mmx
Description
88 Mhz, Precision, Low Noise, 1.8v Cmos Input, Decompensated Operational Amplifier
Manufacturer
National Semiconductor Corporation
Datasheet
1.LMP7718MMX.pdf
(24 pages)
www.national.com
In Figure 18 the ringing and the hump during the on time is
from the laser. The higher drive levels for the laser gave ring-
ing in the light source as well as light changing from the
thermal characteristics. The hump is due to the thermal char-
acteristics.
Solving for C
lated value is 0.54 pF. One of the problems with more gain is
the very small value for C
measured value being 0.64 pF. For the 0.64 pF location the
F
using a 100 kΩ feedback resistor, the calcu-
FIGURE 19. Rise Time
F
. A 0.5 pF capacitor was used, its
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20
pole is at 2.5 MHz. Figure 20 shows the response for a 1V
output.
A transimpedance amplifier is an excellent application for the
LMP7717. Even with the high gain using a 100 kΩ feedback
resistor, the bandwidth is still well over 1 MHz. Other than a
little over compensation for the 10 kΩ feedback resistor con-
figuration using the LMP7717 was quite easy. Of course a
very good board layout was also used for this test.
FIGURE 20. High Gain Response
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