參數(shù)資料
型號(hào)： THS4500CDGK
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，低失真全差動(dòng)放大器
文件頁(yè)數(shù)： 28/37頁(yè)
文件大小： 585K
代理商： THS4500CDGK
SLOS350D APRIL 2002 REVISED JANUARY 2004
www.ti.com
28
As can be seen in the equation, when a higher impedance
is used, the same level of intermodulation distortion
performance results in a lower intercept point. Therefore,
it is important to comprehend the impedance seen by the
output of the fully differential amplifier when selecting a
minimum intercept point. The graphic below shows the
relationship between the strict definition of an intercept
point with a normalized, or equivalent, intercept point for
the THS4502.
Figure 109
40
30
20
15
0
10 20
30 40
f Frequency MHz
50 60
50
55
THIRD-ORDER OUTPUT INTERCEPT POINT
vs
FREQUENCY
60
Normalized to 200
70 80
90 100
45
35
25
Gain = 1
Rf = 392
VS =
±
5 V
Tone Spacing = 200 kHz
OIP3 RL= 800
O3
Comparing specifications between different device types
becomes easier when a common impedance level is
assumed. For this reason, the intercept points on the
THS4500 family of devices are reported normalized to a
50-
load impedance.
AN ANALYSIS OF NOISE IN FULLY
DIFFERENTIAL AMPLIFIERS
Noise analysis in fully differential amplifiers is analogous
to noise analysis in single-ended amplifiers. The same
concepts apply. Below, a generic circuit diagram
consisting of a voltage source, a termination resistor, two
gain setting resistors, two feedback resistors, and a fully
differential amplifier is shown, including all the relevant
noise sources. From this circuit, the noise factor (F) and
noise figure (NF) are calculated. The figures indicate the
appropriate scaling factor for each of the noise sources in
two different cases. The first case includes the termination
resistor, and the second, simplified case assumes that the
voltage source is properly terminated by the gain-setting
resistors. With these scaling factors, the amplifier’s input
noise power (N
A
) can be calculated by summing each
individual noise source with its scaling factor. The noise
delivered to the amplifier by the source (N
I
) and input noise
power are used to calculate the noise factor and noise
figure as shown in equations 23 through 27.
Figure 110. Noise Sources in a Fully
Differential Amplifier Circuit
Ni
NA
Rg
Rf
eg
ef
es
Rs
en
No
ini
iii
Rt
et
Ni
Si
No
So
+
fully-diff
amp
Rg
Rf
eg
ef
R
g
R
f
R
g
R
g
R
s
R
t
2 R
s
R
t
2
(eni)2
(ini)2
(iii)2
4kTRt
2R
s
R
G
R
s
2R
s
R
g
R
s
2R
g
R
t
2R
g
2
4kTRf
2
R
g
R
f
2
4kTRg
2
R
g
R
g
R
s
R
t
2 R
s
R
t
2
NA: Fully Differential Amplifier
Noise
Source
Scale Factor
(12)
(13)
(14)
(15)
(16)
(17)
Rg2
Rg2
Figure 111. Scaling Factors for Individual Noise
Sources Assuming a Finite Value Termination
Resistor
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THS4500CDGKG4 功能描述:特殊用途放大器 High-Speed Fully Differential +/-5 V 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
THS4500CDGKR 功能描述:特殊用途放大器 High-Speed Fully Differential +/-5 V 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
THS4500CDGKRG4 功能描述:特殊用途放大器 High-Speed Fully Differential +/-5 V 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
THS4500CDGN 功能描述:特殊用途放大器 High-Speed Fully Differential +/-5 V 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
THS4500CDGNG4 功能描述:特殊用途放大器 High-Speed Fully Differential +/-5 V 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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