LMH6733 Datasheet, PDF (12/25 Pages) Texas Instruments – Single Supply, 1.0 GHz, Triple Operational Amplifier

LMH6733
SNOSAW0D – JANUARY 2007 – REVISED MAY 2013
APPLICATION INFORMATION
+2.5V _{6.8 PF}
V_IN
R_IN
C_SS
0.01 PF
0.1 PF ^AV ^{= 1 +R}F^/RG ^{= V}OUT^/VIN
C_POS
+
V_OUT
-
C_NEG
0.1 PF ^RF
R_G
6.8 PF
-2.5V
Figure 34. Recommended Non-Inverting Gain Circuit
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25:
V_IN
+2.5V _{6.8 PF}
C_SS
0.01 PF
R_G
0.1 PF
C_POS
+
A_V = -
R_F V_OUT
R_G ⁼ V_IN
V_OUT
-
C_NEG
R_F
0.1 PF
R_T
6.8 PF
SELECT R_T TO
YIELD DESIRED
-2.5V
R_IN = R_T||R_G
Figure 35. Recommended Inverting Gain Circuit
General Information
The LMH6733 is a high speed current feedback amplifier, optimized for very high speed and low distortion. The
LMH6733 has no internal ground reference so single or split supply configurations are both equally useful.
Feedback Resistor Selection
One of the key benefits of a current feedback operational amplifier is the ability to maintain optimum frequency
response independent of gain by using the appropriate values for the feedback resistor (R_F). The Electrical
Characteristics and Typical Performance plots specify an R_F of 340Ω, a gain of +2 V/V and ±2.5V power supplies
(unless otherwise specified). Generally, lowering R_F from its recommended value will peak the frequency
response and extend the bandwidth while increasing the value of R_F will cause the frequency response to roll off
faster. Reducing the value of R_F too far below its recommended value will cause overshoot, ringing and,
eventually, oscillation.
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