lm6182 National Semiconductor Corporation, lm6182 Datasheet - Page 21

• Manufacturer Part Number: lm6182
• Description: Dual 100 Ma Output, 100 Mhz Current Feedback Amplifier
• Manufacturer: National Semiconductor Corporation

Typical Applications
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
LM6182’s dynamic performance.
FIGURE 16. Output Recovery from an Input that
FIGURE 17. LM6182 Is Unity Gain Stable
Exceeds the Common-Mode Range
f
, is required to maintain the
(Continued)
DS011926-47
DS011926-45
DS011926-46
21
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
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.
FIGURE 19. Current Feedback Amplifiers Can Be Used
Determined with the Same Equation Voltage Feedback
Meet the Requirements of Wide Bandwidth Systems
FIGURE 20. LM6182 Allows the Summing Circuit to
for Inverting Gains, Just Like a Voltage Feedback
FIGURE 18. Non-Inverting Closed Loop Gain is
Independent of Signal Gain
Amplifiers Use: 1 + R
Amplifier: −R
f
/Rs.
f
/Rs
f
/Rs
DS011926-48
DS011926-50
DS011926-49
www.national.com