LM6181AMJSLASH883 datasheet(18/23 Pages) NSC

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Typical Applications (Continued)

CAPACITIVE FEEDBACK

For voltage feedback amplifiers it is quite common to place a

small lead compensation capacitor in parallel with feedback

resistance, R

f. This compensation serves to reduce the am-

plifier’s peaking in the frequency domain which equivalently

tames the transient response. To limit the bandwidth of cur-

rent feedback amplifiers, do not use a capacitor across R

The dynamic impedance of capacitors in the feedback loop

reduces the amplifier’s stability. Instead, reduced peaking in

the frequency response, and bandwidth limiting can be ac-

complished by adding an RC circuit, as illustrated in

Figure

7b.

Typical Performance

Characteristics

OVERDRIVE RECOVERY

When the output or input voltage range of a high speed am-

plifier is exceeded, the amplifier must recover from an over-

drive condition. The typical recovery times for open-loop,

closed-loop, and input common-mode voltage range over-

drive conditions are illustrated in

Figures 9, 11, 11, 12 re-

spectively.

The open-loop circuit of

Figure 8 generates an overdrive re-

sponse by allowing the ±0.5V input to exceed the linear in-

put range of the amplifier. Typical positive and negative over-

drive recovery times shown in

Figure 9 are 5 ns and 25 ns,

respectively.

DS011328-20

DS011328-21

FIGURE 6. Resistive Isolation of C

Provides Higher Fidelity Pulse Response. R

and R

S Could Be Increased to Maintain AV = −1

and Improve Pulse Response Characteristics.

DS011328-22

DS011328-23

FIGURE 7. RC Limits Amplifier

Bandwidth to 50 MHz, Eliminating

Peaking in the Resulting Pulse Response

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