SM73302_15 Datasheet, PDF (24/31 Pages) Texas Instruments – SM73302 88 MHz, Precision, Low Noise, 1.8V CMOS Input, Decompensated Operational Amplifier

SM73302
SNOSB93A – AUGUST 2011 – REVISED APRIL 2013
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Figure 62. Rise Time
In Figure 61 the ringing and the hump during the on time is from the laser. The higher drive levels for the laser
gave ringing in the light source as well as light changing from the thermal characteristics. The hump is due to the
thermal characteristics.
Solving for C_F using a 100 kΩ feedback resistor, the calculated value is 0.54 pF. One of the problems with more
gain is the very small value for C_F. A 0.5 pF capacitor was used, its measured value being 0.64 pF. For the 0.64
pF location the pole is at 2.5 MHz. Figure 63 shows the response for a 1V output.
Figure 63. High Gain Response
A transimpedance amplifier is an excellent application for the SM73302. 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 configuration using the SM73302 was quite easy. Of course a very good board layout was also
used for this test.
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