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| 型号： | THS4271DGNR |
| 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： | POWERPAD, PLASTIC, MSOP-8 |
| 文件页数： | 19/48页 |
| 文件大小： | 1227K |
| 代理商： | THS4271DGNR |
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IMD3 = PS - PO
PS
PO
fc = fc - f1
fc = f2 - fc
PS
fc - 3f
f1 fc f2
fc + 3f
Power
f - Frequency - MHz
OIP
3
+ PO )
IMD
3
2
where
P
O
+ 10 log
V2
P
2R
L
0.001
IMD3
OIP3
IIP3
3X
PIN
(dBm)
1X
POUT
(dBm)
PO
PS
SLOS397F – JULY 2002 – REVISED OCTOBER 2009
www.ti.com
Intercept points are specifications long used as key
Due to the intercept point ease of use in system level
design criteria in the RF communications world as a
calculations for receiver chains, it has become the
metric for the intermodulation distortion performance
specification of choice for guiding distortion-related
of a device in the signal chain (e.g., amplifiers,
design decisions. Traditionally, these systems use
mixers, etc.). Use of the intercept point, rather than
primarily class-A, single-ended RF amplifiers as gain
strictly the intermodulation distortion, allows simpler
blocks. These RF amplifiers are typically designed to
system-level calculations. Intercept points, like noise
operate in a 50-
environment. Giving intercept
figures, can be easily cascaded back and forth
points in dBm, implies an associated impedance (50
through a signal chain to determine the overall
).
receiver chain intermodulation distortion performance.
However, with an operational amplifier, the output
The relationship between intermodulation distortion
does not require termination as an RF amplifier
and intercept point is depicted in Figure 85 and
would. Because closed-loop amplifiers deliver signals
to their outputs regardless of the impedance present,
it is important to comprehend this when evaluating
the intercept point of an operational amplifier. The
THS4271 yields optimum distortion performance
when loaded with 150
to 1 k, very similar to the
input impedance of an analog-to-digital converter
over its input frequency band.
As a result, terminating the input of the ADC to 50
can actually be detrimental to systems performance.
The
discontinuity
between
open-loop,
class-A
amplifiers
and
closed-loop,
class-AB
amplifiers
becomes apparent when comparing the intercept
points of the two types of devices. Equation 2 and
Equation 3 give the definition of an intercept point,
relative to the intermodulation distortion.
(2)
Figure 85.
(3)
NOTE: PO is the output power of a single tone, RL
is the load resistance, and VP is the peak
voltage for a single tone.
NOISE ANALYSIS
High slew rate, unity gain stable, voltage-feedback
operational amplifiers usually achieve the slew rate at
the expense of a higher input noise voltage. The
3-nV/
√Hz input voltage noise for the THS4271 and
THS4275 is, however, much lower than comparable
amplifiers. The input-referred voltage noise, and the
two input-referred current noise terms (3 pA/
√Hz),
combine to give low output noise under a wide variety
of operating conditions. Figure 87 shows the amplifier
noise analysis model with all the noise terms
included. In this model, all noise terms are taken to
be noise voltage or current density terms in either
nV/
√Hz or pA/√Hz.
Figure 86.
26
Copyright 2002–2009, Texas Instruments Incorporated
相关PDF资料 |
PDF描述 |
|---|---|
| THS4271DGN | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| THS4271DRBR | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| THS4271DR | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| THS4271D | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| THS4271DRBT | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| THS4271DGNRG4 | 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 |
| THS4271DR | 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 |
| THS4271DRBR | 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 |
| THS4271DRBRG4 | 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 |
| THS4271DRBT | 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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