THS3092_14 Datasheet, PDF (16/45 Pages) Texas Instruments – HIGH-VOLTAGE, LOW-DISTORTION, CURRENT-FEEDBACK OPERATIONAL AMPLIFIERS

THS3092
THS3096
SLOS428B – DECEMBER 2003 – REVISED FEBRUARY 2006
www.ti.com
APPLICATION INFORMATION
WIDEBAND, NONINVERTING OPERATION
The THS3092/6 are unity gain stable 135-MHz
current-feedback operational amplifiers, designed to
operate from a ±5-V to ±15-V power supply.
Figure 52 shows the THS3092 in a noninverting gain
of 2-V/V configuration typically used to generate the
performance curves. Most of the curves were
characterized using signal sources with 50-Ω source
impedance, and with measurement equipment
presenting a 50-Ω load impedance.
15 V _+VS
50 Ω Source
V_I
+
49.9 Ω
_
909 Ω R_G
0.1 µF
+
6.8 µF
49.9 Ω
R_F
909 Ω
50 Ω LOAD
0.1 µF
6.8 µF
+
−V_S
−15 V
Figure 52. Wideband, Noninverting Gain
Configuration
the feedback resistor R_F for maximum performance
and stability. Table 1 shows the optimal gain setting
resistors R_F and R_G at different gains to give
maximum bandwidth with minimal peaking in the
frequency response. Higher bandwidths can be
achieved, at the expense of added peaking in the
frequency response, by using even lower values for
R_F. Conversely, increasing R_F decreases the
bandwidth, but stability is improved.
Table 1. Recommended Resistor Values for
Optimum Frequency Response
THS3092 and THS3096 R_F and R_G values for minimal peaking
with R_L = 100 Ω
GAIN (V/V)
SUPPLY VOLTAGE
(V)
R_G (Ω)
R_F (Ω)
±15
--
1.1 k
1
±5
--
1.1 k
±15
909
909
2
±5
909
909
±15
178
715
5
±5
178
715
±15
66.5
604
10
±5
66.5
604
-1
±15 and ±5
909
909
-2
±15 and ±5
402
806
-5
±15 and ±5
143
715
-10
±15 and ±5
60.4
604
Current-feedback amplifiers are highly dependent on
16
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