LMH6715 Datasheet, PDF (11/12 Pages) National Semiconductor (TI) – Dual Wideband Video Op Amp

Applications Circuits (Continued)
LOW NOISE WIDE-BANDWIDTH TRANSIMPEDANCE
AMPLIFIER
Figure 7 implements a low noise transimpedance amplifier
using both channels of the LMH6715. This circuit takes
advantage of the lower input bias current noise of the non-
inverting input and achieves negative feedback through the
second LMH6715 channel. The output voltage is set by the
value of R_F while frequency compensation is achieved
through the adjustment of R_T.
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FIGURE 5. Differential Line Receiver with CMRR
Adjustment
NON-INVERTING CURRENT-FEEDBACK INTEGRATOR
The circuit of Figure 6 achieves its high speed integration by
placing one of the LMH6715’s amplifiers in the feedback
loop of the second amplifier configured as shown.
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FIGURE 7. Low-Noise, Wide Bandwidth,
Transimpedance Amp.
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FIGURE 6. Current Feedback Integrator
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