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參數(shù)資料
| 型號(hào)： | THS3002ID |
| 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 |
| 文件頁數(shù)： | 21/32頁 |
| 文件大?。?/td> | 633K |
| 代理商： | THS3002ID |
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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
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| THS3002IDGN | 制造商:TI 制造商全稱:Texas Instruments 功能描述:420-MHz HIGH-SPEED CURRENT-FEEDBACK AMPLIFIERS |
| THS3014 | 功能描述:手持示波器 100 MHz 4 Channel Handheld Scope RoHS:否 制造商:Fluke 帶寬:200 MHz 采樣比:2.5 GS/s 顯示器類型:153 mm Full Color LCD 設(shè)備類型:Oscilloscopes |
| THS3014 CAL D | 制造商:DANAHER - TEKTRONIX 功能描述:TEK P/N THS3014 CALIBRATED W/DATA BY TRANSCAT, CHILD SKU # 63T8001 制造商:Tektronix Inc 功能描述:TEK P/N THS3014 CALIBRATED W/DATA BY TRANSCAT, CHILD SKU # 63T8001 |
| THS3014-TK | 功能描述:手持示波器 100 MHz 4 Channel Handheld w/ Trvl Kit RoHS:否 制造商:Fluke 帶寬:200 MHz 采樣比:2.5 GS/s 顯示器類型:153 mm Full Color LCD 設(shè)備類型:Oscilloscopes |
| THS3024 | 功能描述:手持示波器 200 MHz 4 Channel Handheld Scope RoHS:否 制造商:Fluke 帶寬:200 MHz 采樣比:2.5 GS/s 顯示器類型:153 mm Full Color LCD 設(shè)備類型:Oscilloscopes |
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