参数资料
型号: THS3201DGNRG4
厂商: TEXAS INSTRUMENTS INC
元件分类: 音频/视频放大
英文描述: 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
封装: GREEN, PLASTIC, MSOP-8
文件页数: 8/37页
文件大小: 1116K
代理商: THS3201DGNRG4
APPLICATION INFORMATION
WIDEBAND, NONINVERTING OPERATION
WIDEBAND, INVERTING GAIN OPERATION
_
+
THS3201
RF
768
49.9
100 pF
0.1
F
6.8
F
-VS
-7.5 V
RG
50
Source
+
VI
100 pF
0.1
F
6.8
F
+
+VS
7.5 V
50
768
49.9
_
+
THS3201
RG
287
100 pF
0.1
F
6.8
F
-VS
-7.5 V
50
Source
+
VI
100 pF
0.1
F
6.8
F
+
+VS
7.5 V
RF
576
RM
60.4
50
49.9
SLOS416C – JUNE 2003 – REVISED JUNE 2009 ............................................................................................................................................................. www.ti.com
Table 1. Recommended Resistor Values for
Optimum Frequency Response
The
THS3201
is
a
unity-gain
stable,
1.8-GHz
THS3201 RF for AC When RLOAD = 100
current-feedback operational amplifier, designed to
Gain
Supply Voltage
RG
RF
operate from a ±3.3-V to ±7.5-V power supply.
(V/V)
(V)
(
)
(
)
Figure 55 shows the THS3201 in a noninverting gain
±7.5
1.2 k
1
of 2-V/V configuration typically used to generate the
±5
1.2 k
performance
curves.
Most
of
the
curves
were
±7.5
768
characterized using signal sources with 50-
source
2
±5
715
impedance,
and
with
measurement
equipment
presenting a 50-
load impedance. The 49.9- shunt
±7.5
154.9
619
5
resistor at the VI terminal in Figure 55 matches the
±5
143
576
source impedance of the test generator.
±7.5
54.9
487
10
±5
51.1
464
±7.5
619
–1
±5
576
–2
±7.5 and ±5
287
576
–5
±7.5 and ±5
110
549
–10
±7.5 and ±5
49.9
499
Figure 56 shows the THS3201 in a typical inverting
gain
configuration
where
the
input
and
output
impedances and signal gain from Figure 55 are
retained in an inverting circuit configuration.
Figure 55. Wideband, Noninverting
Gain Configuration
Unlike voltage-feedback amplifiers, current-feedback
amplifiers are highly dependent on the feedback
resistor RF for maximum performance and stability.
Table 1 shows the optimal gain setting resistors RF
and RG 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 RF. Conversely, increasing RF
decreases the bandwidth, but stability is improved.
Figure 56. Wideband, Inverting Gain
Configuration
16
Copyright 2003–2009, Texas Instruments Incorporated
Product Folder Link(s): THS3201
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