參數(shù)資料
型號： THS7002CPWP
廠商： TEXAS INSTRUMENTS INC
元件分類： 模擬信號調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, PDSO28
封裝： GREEN, PLASTIC, HTSSOP-28
文件頁數(shù)： 9/41頁
文件大?。?/td> 1203K
代理商： THS7002CPWP
THS7001, THS7002
70MHz PROGRAMMABLEGAIN AMPLIFIERS
SLOS214C OCTOBER 1998 REVISED MARCH 2007
17
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
noise calculations and noise figure (continued)
RF1
A1
Vin
_
+
_
+
RG1
RF2
RG2
eni1
+
eno1
eni2
eno2
AV1= 1+
RF1
RG1
AV2= 1+
RF2
RG2
Figure 53. Simplified Composite Amplifier System
The noise due to amplifier 1 (A1) is the same as derived in equations 1 and 2. The composite system noise is
calculated as follows:
e
no2 +
e
ni2
2
) e
no1
2
A
V2
(3)
+
e
ni2
2
) e
ni1
A
V1
2
A
V2
In a typical system, amplifier 1 (A1) has a large gain (AV1). Because the noise is summed in the RMS method,
if the A1 output noise is more than 25% larger than the input noise of amplifier 2, the contribution of
amplifier 2’s input noise to the composite amplifier output noise can effectively be ignored. This reduces
equation 3 down to:
(4)
e
no2
e
ni1
A
V1
A
V2
Equation 4 shows that the very first amplifier (the preamplifier) is critical in any low-level signal system. This also
shows that practically any noisy amplifier can be used after the preamplifier with minimal SNR degradation.
For more information on noise analysis, please refer to the Noise Analysis section in Operational Amplifier
Circuits Applications Report (literature number SLVA043).
This brings up another noise measurement usually preferred in RF applications, the noise figure (NF). Noise
figure is a measure of noise degradation caused by the amplifier. The value of the source resistance must be
defined and is typically 50
in RF applications.
NF
+ 10log
e
2
ni
e
Rs
2
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相關(guān)代理商/技術(shù)參數(shù)
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THS7002CPWPG4 功能描述:特殊用途放大器 70-MHz Hi-Spd Dual Prgrmbl-Gain Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補償電壓: 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
THS7002CPWPR 功能描述:特殊用途放大器 70-MHz Programmable- Gain Dual RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補償電壓: 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
THS7002CPWPRG4 功能描述:特殊用途放大器 70-MHz Programmable- Gain Dual RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補償電壓: 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
THS7002EVM 功能描述:放大器 IC 開發(fā)工具 THS7002 Hi-Spd Amp Eval Mod RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V
THS7002IPWP 功能描述:特殊用途放大器 70-MHz Programmable- Gain Dual RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補償電壓: 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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