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參數(shù)資料
| 型號： | THS4211DRB |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 16/40頁 |
| 文件大?。?/td> | 1013K |
| 代理商： | THS4211DRB |
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THS4211
THS4215
SLOS400C SEPTEMBER 2002 REVISED JANUARY 2004
www.ti.com
23
Intercept points are specifications long used as key design
criteria in the RF communications world as a metric for the
intermodulation distortion performance of a device in the
signal chain (e.g., amplifiers, mixers, etc.). Use of the
intercept point, rather than strictly the intermodulation
distortion,
allows
simpler
system-level calculations.
Intercept points, like noise figures, can be easily cascaded
back and forth through a signal chain to determine the
overall
receiver
chain’s
intermodulation
distortion
performance. The relationship between intermodulation
distortion and intercept point is depicted in Figure 85 and
Figure 86.
Figure 85
IMD3 = PS PO
PS
PO
fc = fc f1
fc = f2 fc
PS
fc 3ff1 fc f2
fc + 3f
Power
f Frequency MHz
Figure 86
IMD3
OIP3
IIP3
3X
PIN
(dBm)
1X
POUT
(dBm)
PO
PS
Due to the intercept point’s ease of use in system level
calculations for receiver chains, it has become the
specification of choice for guiding distortion-related design
decisions. Traditionally, these systems use primarily
class-A, single-ended RF amplifiers as gain blocks. These
RF amplifiers are typically designed to operate in a 50-
environment. Giving intercept points in dBm implies an
associated impedance (50
).
However, with an operational amplifier, the output does not
require termination as an RF amplifier 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 THS4211 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. Equations 1 and 2 gives the definition of an
intercept point, relative to the intermodulation distortion.
OIP
3 + PO )
IMD
3
2
where
P
O + 10 log
V2
P
2R
L
0.001
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 their slew rate at the
expense of a higher input noise voltage. The 7 nV/
√Hz
input voltage noise for the THS4211 and THS4215 is,
however, much lower than comparable amplifiers. The
input-referred voltage noise, and the two input-referred
current noise terms (4 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.
(2)
(3)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| THS4211DRBR | 功能描述:高速運(yùn)算放大器 Super-Fast Ultr-Lo- Distortion Hi-Speed RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| THS4211DRBRG4 | 功能描述:高速運(yùn)算放大器 Super-Fast Ultr-Lo- Distortion Hi-Speed RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| THS4211DRBT | 功能描述:高速運(yùn)算放大器 Super-Fast Ultr-Lo- Distortion Hi-Speed RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| THS4211DRBTG4 | 功能描述:高速運(yùn)算放大器 Super-Fast Ultr-Lo- Distortion Hi-Speed RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| THS4211DRG4 | 功能描述:高速運(yùn)算放大器 Super-Fast Ultr-Lo- Distortion Hi-Speed RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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