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参数资料
型号： THS4271DGKRG4
厂商： TEXAS INSTRUMENTS INC
元件分类： 音频／视频放大
英文描述： 1 CHANNEL, VIDEO PREAMPLIFIER, PDSO8
封装： GREEN, PLASTIC, MSOP-8
文件页数： 18/48页
文件大小： 1227K
代理商： THS4271DGKRG4
_
+
49.9
100
VO+
VI+
_
+
49.9
100
VO
499
249
249
100
VI
_
+
100
VO
VI+
_
+
Rg1
Rf1
100
VI-
_
+
Rf2
49.9
Rf1
Rg2
Rf2
49.9
THS4271
V
O
+
1
2
1 )
2R
f1
R
g1
V
i)–Vi–
R
f2
R
g2
THS4271
THS4275
www.ti.com
SLOS397F – JULY 2002 – REVISED OCTOBER 2009
A Low-Noise Receiver With the THS4271
THEORY AND GUIDELINES
A combination of two THS4271 amplifiers can create
Distortion Performance
a high-speed, low-distortion, low-noise differential
receiver circuit as depicted in Figure 83. With both
The
THS4271
provides
excellent
distortion
amplifiers operating in the noninverting mode of
performance into a 150-
load. Relative to alternative
operation, the circuit presents a high load impedance
solutions, it provides exceptional performance into
to the source. The designer has the option of
lighter loads, as well as exceptional performance on a
controlling
the
impedance
through
termination
single 5-V supply. Generally, until the fundamental
resistors if a matched termination impedance is
signal reaches very high frequency or power levels,
desired.
the second harmonic dominates the total harmonic
distortion with a negligible third harmonic component.
Focusing then on the second 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
THS4271
features
excellent
distortion
performance for monolithic operational amplifiers.
This
section
focuses
on
the
fundamentals
of
Figure 83. A High Input Impedance, Low-Noise,
distortion, circuit techniques for reducing nonlinearity,
Differential Receiver
and methods for equating distortion of operational
amplifiers to desired linearity specifications in RF
receiver chains.
A modification on this circuit to include a difference
amplifier
turns
this
circuit
into
a
high-speed
Amplifiers are generally thought of as linear devices.
instrumentation amplifier, as shown in Figure 84.
The output of an amplifier is a linearly-scaled version
Equation 1 calculates the output voltage for this
of the input signal applied to it. However, amplifier
circuit.
transfer functions are nonlinear. Minimizing amplifier
nonlinearity is a primary design goal in many
applications.
Figure 84. A High-Speed Instrumentation
Amplifier
(1)
space
Copyright 2002–2009, Texas Instruments Incorporated
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Product Folder Link(s): THS4271 THS4275
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相关代理商/技术参数
参数描述
THS4271DGN 功能描述:高速运算放大器 Super-Fast Ultra-Low Distortion 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
THS4271DGN 制造商:Texas Instruments 功能描述:IC SM OP-AMP HI-SPEED VFB
THS4271DGN 制造商:Texas Instruments 功能描述:OP AMP HIGH SPEED VFB HTSSOP 427
THS4271DGNG4 功能描述:高速运算放大器 Super-Fast Ultra-Low Distortion 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
THS4271DGNR 功能描述:高速运算放大器 Super-Fast Ultra-Low Distortion 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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