參數(shù)資料
型號(hào): THS6043CD
廠商: Texas Instruments, Inc.
英文描述: 350 mA, 【12 V ADSL CPE LINE DRIVERS
中文描述: 350毫安,【12伏ADSL終端線路驅(qū)動(dòng)器
文件頁(yè)數(shù): 20/33頁(yè)
文件大?。?/td> 509K
代理商: THS6043CD
THS6042, THS6043
350 mA,
±
12 V ADSL CPE LINE DRIVERS
SLOS264G
MARCH 2000
REVISED DECEMBER 2001
20
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
noise calculations and noise figure (continued)
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
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 kTR
S
Figure 39 shows the noise figure graph for the THS6042/3.
0
2
4
6
8
10
12
14
16
10
100
1 k
10 k
N
RS
Source Resistance
f = 10 kHz
TA = 25
°
C
Figure 39. Noise Figure vs Source Resistance
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THS6043EVM 350 mA, 【12 V ADSL CPE LINE DRIVERS
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相關(guān)代理商/技術(shù)參數(shù)
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