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參數(shù)資料
| 型號(hào)： | THS4504DGKR |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | WIDEBAND, LOW-DISTORTION, FULLY DIFFERENTIAL AMPLIFIERS |
| 中文描述： | 寬帶，低失真，全差分放大器 |
| 文件頁數(shù)： | 26/38頁 |
| 文件大?。?/td> | 1094K |
| 代理商： | THS4504DGKR |
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LINEARITY: DEFINITIONS, TERMINOLOGY,
CIRCUIT TECHNIQUES, AND DESIGN
TRADEOFFS
The THS4500 family of devices features unpre-
cedented distortion performance for monolithic fully
differential amplifiers. This section focuses on the
fundamentals of distortion, circuit techniques for re-
ducing nonlinearity, and methods for equating distor-
tion of fully differential amplifiers to desired linearity
specifications in RF receiver chains.
V
OCM
= 2.5 V
5 V
V
S
R
S
R
g1
R
g2
R
f1
R
f2
+
R
T
+
R
L
2.5-V DC
2.5-V DC
DC Current Path to Ground
DC Current Path to Ground
I
2
=
V
OCM
R
f2
+ R
g2
Depiction of DC Power Dissipation Caused By
Output Level-Shifting in a DC-Coupled Circuit
I
1
=
V
OCM
R
f1
+ R
g1
+ R
S
|| R
T
SAVING POWER WITH POWER-DOWN
FUNCTIONALITY
The THS4500 family of fully differential amplifiers
contains devices that come with and without the
power-down option. Even-numbered devices have
power-down capability, which is described in detail
here.
IMD
3
= P
S
P
O
P
S
P
O
P
O
f
c
= f
c
f1
f
c
= f2 f
c
P
S
f
c
3
f
f1 f
c
f2
f
c
+ 3
f
P
f Frequency MHz
THS4504
THS4505
SLOS363C–AUGUST 2002–REVISED MARCH 2004
device.
feedback network in order to provide the circuit with
the proper operating point. While there are no serious
effects on the circuit performance, the extra power
dissipation may need to be included in the system's
power budget.
The
amplifier
sources
current
into
the
The time delays associated with turning the device on
and off are specified as the time it takes for the
amplifier to reach 50% of the nominal quiescent
current. The time delays are on the order of
microseconds because the amplifier moves in and out
of the linear mode of operation in these transitions.
Amplifiers are generally thought of as
linear
devices.
In other words, the output of an amplifier is a linearly
scaled version of the input signal applied to it. In
reality, however, amplifier transfer functions are
nonlinear. Minimizing amplifier nonlinearity is a pri-
mary design goal in many applications.
Intercept points are specifications that have long
been used as key design criteria in the RF communi-
cations 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 distor-
tion, allows for 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 de-
picted in Figure 85 and Figure 86.
Figure 84.
The power-down pin of the amplifiers defaults to the
positive supply voltage in the absence of an applied
voltage (i.e. an internal pullup resistor is present),
putting the amplifier in the
power-on
mode of oper-
ation. To turn off the amplifier in an effort to conserve
power, the power-down pin can be driven towards the
negative rail. The threshold voltages for power-on
and power-down are relative to the supply rails and
given in the specification tables. Above the
enable
threshold voltage
, the device is on. Below the
disable
threshold voltage
, the device is off. Behavior in
between these threshold voltages is not specified.
Note that this power-down functionality is just that;
the amplifier consumes less power in power-down
mode. The power-down mode is not intended to
provide a high-impedance output. In other words, the
power-down functionality is not intended to allow use
as a 3-state bus driver. When in power-down mode,
the impedance looking back into the output of the
amplifier is dominated by the feedback and gain
setting resistors.
Figure 85.
26
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| THS4504DGKRG4 | 功能描述:特殊用途放大器 Wideband Lo-Noise Lo-Distortion RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| THS4504DGN | 功能描述:特殊用途放大器 Wideband Lo-Noise Lo-Distortion RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| THS4504DGN | 制造商:Texas Instruments 功能描述:IC OP-AMP DIFF 210MHZ SGL 8MSOP |
| THS4504DGNG4 | 功能描述:特殊用途放大器 Wideband Lo-Noise Lo-Distortion RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| THS4504DGNR | 功能描述:特殊用途放大器 Wideband Lo-Noise Lo-Distortion RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
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