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参数资料
| 型号： | THS4215DGK |
| 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： | 17/47页 |
| 文件大小： | 1197K |
| 代理商： | THS4215DGK |
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_
+
100
VO
VI+
_
+
Rg1
Rf1
100
VI-
_
+
Rf2
49.9
Rf1
Rg2
Rf2
49.9
THS4211
V
O
+
1
2
1 )
2R
f1
R
g1
V
i)–Vi–
R
f2
R
g2
IMD3 = PS - PO
PS
PO
fc = fc - f1
fc = f2 - fc
PS
fc - 3f
f1 fc f2
fc + 3f
Power
f - Frequency - MHz
SLOS400E – SEPTEMBER 2002 – REVISED SEPTEMBER 2009 ................................................................................................................................... www.ti.com
A modification on this circuit to include a difference
LINEARITY: DEFINITIONS, TERMINOLOGY,
amplifier
turns
this
circuit
into
a
high-speed
CIRCUIT TECHNIQUES, AND DESIGN
instrumentation amplifier, as shown in Figure 84.
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.
Intercept points are specifications long used as key
design criteria in the RF communications world as a
metric for the intermodulation distortion performance
Figure 84. A High-Speed Instrumentation
of a device in the signal chain (e.g., amplifiers,
Amplifier
mixers, etc.). Use of the intercept point, rather than
strictly the intermodulation distortion, allows simpler
system-level calculations. Intercept points, like noise
(1)
figures, can be easily cascaded back and forth
through a signal chain to determine the overall
receiver
chain's
intermodulation
distortion
THEORY AND GUIDELINES
performance.
The
relationship
between
intermodulation
distortion
and
intercept
point
is
Distortion Performance
depicted in Figure 85 and Figure 86.
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 dominates the total harmonic
distortion with a negligible 3rd harmonic component.
Focusing then on the 2nd harmonic, increasing the
load impedance directly improves distortion. 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
with the actual load.
space
Figure 85.
24
Copyright 2002–2009, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| THS4215DGKG4 | 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 |
| THS4215DGKR | 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 |
| THS4215DGKRG4 | 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 |
| THS4215DGN | 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 |
| THS4215DGNG4 | 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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