LM6182 datasheet(21/24 Pages) NSC

21 / 24 page

Typical Applications (Continued)

The common-mode input range of a unity-gain circuit is ex-

ceeded by a 4V pulse resulting in a typical recovery time of

20 ns shown in

Figure 16.

SPICE MACROMODEL

A spice macromodel is available for the LM6182. Contact

your local National Semiconductor sales office to obtain an

operational amplifier spice model library disk.

Typical Application Circuits

UNITY GAIN AMPLIFIER

The LM6182 current feedback amplifier is unity gain stable.

The feedback resistor, R

is required to maintain the

LM6182’s dynamic performance.

NON-INVERTING GAIN AMPLIFIER

Current feedback amplifiers can be used in non-inverting

gain and level shifting functions. The same basic closed-loop

gain equation used for voltage feedback amplifiers applies to

current feedback amplifiers:1+R

f/Rs.

INVERTING GAIN AMPLIFIER

The inverting closed loop gain equation used with voltage

feedback amplifiers also applies to current feedback

amplifiers.

SUMMING AMPLIFIER

The current feedback topology of the LM6182 provides sig-

nificant performance advantages over a conventional volt-

age feedback amplifier used in a standard summing circuit.

Using a voltage feedback amplifier, the bandwidth of the

summing circuit in

Figure 20 is limited by the highest gain

needed for either signal V1 or V2. If the LM6182 amplifier is

used instead, wide circuit bandwidth can be maintained rela-

tively independent of gain requirements.

DS011926-45

DS011926-46

FIGURE 16. Output Recovery from an Input that

Exceeds the Common-Mode Range

DS011926-47

FIGURE 17. LM6182 Is Unity Gain Stable

DS011926-48

FIGURE 18. Non-Inverting Closed Loop Gain is

Determined with the Same Equation Voltage Feedback

Amplifiers Use:1+R

f/Rs

DS011926-49

FIGURE 19. Current Feedback Amplifiers Can Be Used

for Inverting Gains, Just Like a Voltage Feedback

Amplifier: −R

f/Rs

DS011926-50

FIGURE 20. LM6182 Allows the Summing Circuit to

Meet the Requirements of Wide Bandwidth Systems

Independent of Signal Gain

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