參數(shù)資料
型號(hào)： THS3001DGN
廠商： Texas Instruments, Inc.
英文描述： 420-MHz HIGH-SPEED CURRENT-FEEDBACK AMPLIFIERS
中文描述： 420 - MHz高速電流反饋放大器
文件頁(yè)數(shù)： 21/32頁(yè)
文件大小： 633K
代理商： THS3001DGN
THS3001, THS3002
420-MHz HIGH-SPEED CURRENT-FEEDBACK AMPLIFIERS
SLOS217A – JULY 1998 – REVISED JUNE 1999
21
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
noise calculations and noise figure (continued)
As the previous equations show, to keep noise at a minimum, small value resistors should be used. As the
closed-loop gain is increased (by reducing R
G
), the input noise is reduced considerably because of the parallel
resistance term. This leads to the general conclusion that the most dominant noise sources are the source
resistor (R
S
) and the internal amplifier noise voltage (e
n
). Because noise is summed in a root-mean-squares
method, noise sources smaller than 25% of the largest noise source can be effectively ignored. This can greatly
simplify the formula and make noise calculations much easier.
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.
2
ni
eRs2
NF
10log
e
Because the dominant noise components are generally the source resistance and the internal amplifier noise
voltage, we can approximate noise figure as:
NF
10log
1
en
2
IN
RS
2
4 kTRS
The Figure 50 shows the noise figure graph for the THS300x.
NOISE FIGURE
vs
SOURCE RESISTANCE
10
100
10k
RS – Source Resistance –
1k
f = 10 kHz
TA = 25
°
C
12
8
4
0
10
6
2
20
16
18
14
N
Figure 50. Noise Figure vs Source Resistance
相關(guān)PDF資料
PDF描述
THS3001EVM 420-MHz HIGH-SPEED CURRENT-FEEDBACK AMPLIFIERS
THS3002 420-MHz HIGH-SPEED CURRENT-FEEDBACK AMPLIFIERS
THS3002CD 420-MHz HIGH-SPEED CURRENT-FEEDBACK AMPLIFIERS
THS3002D 420-MHz HIGH-SPEED CURRENT-FEEDBACK AMPLIFIERS
THS3002DGN 420-MHz HIGH-SPEED CURRENT-FEEDBACK AMPLIFIERS
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
THS3001-DIE 制造商:TI 制造商全稱:Texas Instruments 功能描述:420-MHz HIGH-SPEED CURRENT-FEEDBACK AMPLIFIER
THS3001EVM 功能描述:放大器 IC 開(kāi)發(fā)工具 THS3001 Eval Mod RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評(píng)估:IR4302 工作電源電壓:13 V to 23 V
THS3001HVCDGN 功能描述:高速運(yùn)算放大器 420-MHz Curr Feedback Amp 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
THS3001HVCDGNG4 功能描述:高速運(yùn)算放大器 420-MHz Curr Feedback Amp 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
THS3001HVCDGNR 功能描述:高速運(yùn)算放大器 420 MHz Curr Feedback Amp 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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