THS3091 Datasheet, PDF (33/45 Pages) Texas Instruments – HIGH-VOLTAGE, LOW-DISTORTION, CURRENT-FEEDBACK OPERATIONAL AMPLIFIERS

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Typical Application (continued)
R_G
250 W
R_F
1 kW
R_SOURCE
50 W
V_IN
R_T
50 W
V-
THS3091
U3
V+
R_S
50 W
THS3091, THS3095
SLOS423H – SEPTEMBER 2003 – REVISED DECEMBER 2015
TL2
Characteristic
Impedance
50 W
V_OUT
R_LOAD
50 W
R_SOURCE
50 W
V_IN
R_G1
250 W
R_T1
100 W
R_G2
250 W
R_F1
1 kW
V-
THS3091
U1
V+
R_S1
100 W
R_F2
1 kW
V+
V₁
15 V
V-
V₂
-15 V
TL1
Characteristic
Impedance
50 W
V_OUT
R_LOAD
50 W
R_T2
100 W
V-
THS3091
U2
V+
R_S2
100 W
Figure 71. Reference THS3091 and THS3091 Load Sharing Test Configurations
8.2.1 Design Requirements
Use two THS3091 amplifiers in a parallel load-sharing circuit to improve distortion performance.
Table 5. Design Parameters
DESIGN PARAMETER
V_OPP
R_LOAD
VALUE
20 V
100 Ω
8.2.2 Detailed Design Procedure
In addition to providing higher output current drive to the load, the load sharing configuration can also provide
improved distortion performance. In many cases, an operational amplifier shows better distortion performance as
the load current decreases (that is, for higher resistive loads) until the feedback resistor starts to dominate the
current load. In a load sharing configuration of N amplifiers in parallel, the equivalent current load that each
amplifier drives is 1/N times the total load current. For example, in a two-amplifier load sharing configuration with
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