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| 型号： | THS4211DRB |
| 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： | PLASTIC, MSOP-8 |
| 文件页数： | 15/40页 |
| 文件大小： | 1013K |
| 代理商： | THS4211DRB |
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THS4211
THS4215
SLOS400C SEPTEMBER 2002 REVISED JANUARY 2004
www.ti.com
22
_
+
THS4211
49.9
50
Source
392
3.9 pF
5 V
33 pF
VO
392
57.6
VI
Figure 82. A Two-Pole Active Filter With Two
Poles Between 90 MHz and 100 MHz
A Low-Noise Receiver With the THS4211
A combination of two THS4211 amplifiers can create a
high-speed, low-distortion, low-noise differential receiver
circuit as depicted in Figure 83. With both amplifiers
operating in the noninverting mode of operation, the circuit
presents a high load impedance to the source.
The
designer has the option of controlling the impedance
through termination resistors if a matched termination
impedance is desired.
_
+
49.9
100
VO+
VI+
_
+
49.9
100
VO
787
392
392
100
VI
Figure 83. A High Input Impedance, Low
Noise, Differential Receiver
A modification on this circuit to include a difference
amplifier turns this circuit into a high-speed instrumenta-
tion amplifier, as shown in Figure 84.
_
+
100
VO
VI+
_
+
Rg1
Rf1
100
VI
_
+
Rf2
49.9
Rf1
Rg2
Rf2
49.9
THS4211
Figure 84. A High-Speed Instrumentation
Amplifier
V
O +
1
2
1
)
2R
f1
R
g1
V
i
)–Vi–
R
f2
R
g2
THEORY AND GUIDELINES
Distortion Performance
The THS4211 provides excellent distortion performance
into a 150-
load. Relative to alternative solutions, it
provides exceptional performance into lighter loads, as
well as exceptional performance on a single 5-V supply.
Generally, until the fundamental signal reaches very high
frequency or power levels, the 2nd harmonic will dominate
the total harmonic distortion with a negligible 3rd harmonic
component. Focusing then on the 2nd
harmonic,
increasing the load impedance improves distortion
directly. The total load includes the feedback network; in
the noninverting configuration (Figure 75) this is the sum
of Rf and Rg, while in the inverting configuration
(Figure 76), only Rf needs to be included in parallel with
the actual load.
LINEARITY: DEFINITIONS, TERMINOLOGY,
CIRCUIT TECHNIQUES, AND DESIGN
TRADEOFFS
The THS4211 features execllent distortion performance
for monolithic operational amplifiers. This section focuses
on the fundamentals of distortion, circuit techniques for
reducing nonlinearity, and methods for equating distortion
of operational amplifiers to desired linearity specifications
in RF receiver chains.
Amplifiers are generally thought of as linear devices. The
output of an amplifier is a linearly scaled version of the
input signal applied to it. However, amplifier transfer
functions are nonlinear. Minimizing amplifier nonlinearity
is a primary design goal in many applications.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| THS4211DRBR | 功能描述:高速运算放大器 Super-Fast Ultr-Lo- Distortion Hi-Speed RoHS:否 制造商:Texas Instruments 通道数量:1 电压增益 dB:116 dB 输入补偿电压:0.5 mV 转换速度:55 V/us 工作电源电压:36 V 电源电流:7.5 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| THS4211DRBRG4 | 功能描述:高速运算放大器 Super-Fast Ultr-Lo- Distortion Hi-Speed RoHS:否 制造商:Texas Instruments 通道数量:1 电压增益 dB:116 dB 输入补偿电压:0.5 mV 转换速度:55 V/us 工作电源电压:36 V 电源电流:7.5 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| THS4211DRBT | 功能描述:高速运算放大器 Super-Fast Ultr-Lo- Distortion Hi-Speed RoHS:否 制造商:Texas Instruments 通道数量:1 电压增益 dB:116 dB 输入补偿电压:0.5 mV 转换速度:55 V/us 工作电源电压:36 V 电源电流:7.5 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| THS4211DRBTG4 | 功能描述:高速运算放大器 Super-Fast Ultr-Lo- Distortion Hi-Speed RoHS:否 制造商:Texas Instruments 通道数量:1 电压增益 dB:116 dB 输入补偿电压:0.5 mV 转换速度:55 V/us 工作电源电压:36 V 电源电流:7.5 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| THS4211DRG4 | 功能描述:高速运算放大器 Super-Fast Ultr-Lo- Distortion Hi-Speed RoHS:否 制造商:Texas Instruments 通道数量:1 电压增益 dB:116 dB 输入补偿电压:0.5 mV 转换速度:55 V/us 工作电源电压:36 V 电源电流:7.5 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
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