OP-160_15 Datasheet, PDF (13/24 Pages) Analog Devices – High-Speed, Current Feedback Operational Amplifier

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OP-160
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INPUT STAGE
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OUTPUT
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FIGURE5: Simplified schematic of the OP-160 showing the three stages of the amplifier.
SLEW RATE vS
SLEW RATE vs
NONINVERTING GAIN
INVERTINGGAIN
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FIGURE 6: Slew rate of the OP-160 in noninverting (a) and inverting (b) configurations-
and 0'5- This increases the base drive to the output transistor
0,7' Simultaneously, the increased current in 09 drives 0'3
which reduces base drive to the complementary output transis-
tor a,s This push-pull action produces a very fast output slew
rate. For a small voltage step, the OP-160's slew rate is depend-
ent on the available current from the two current sources (IAand
18)that drive as and °6"
To increase the slew rate, transistors 0, and °2 have been
added to boost the base drive to 05 and 06" Inlowgains, a large
input step willturn on A, or O2increasing the slew rate dramati-
cally as illustrated in Figure 6.
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