參數(shù)資料
型號(hào): THS6022GQE
廠商: Texas Instruments, Inc.
英文描述: 250-mA DUAL DIFFERENTIAL LINE DRIVER
中文描述: 250毫安雙差分線路驅(qū)動(dòng)器
文件頁(yè)數(shù): 26/38頁(yè)
文件大?。?/td> 646K
代理商: THS6022GQE
THS6022
250-mA DUAL DIFFERENTIAL LINE DRIVER
SLOS225C – SEPTEMBER 1998 – REVISED JANUARY 2000
26
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 52 shows the noise figure graph for the THS6022.
NOISE FIGURE
vs
SOURCE RESISTANCE
18
14
0
20
16
12
N
Rs – Source Resistance –
10
100
1 k
10 k
TA = 25
°
C
8
4
10
6
2
Figure 52. Noise Figure vs Source Resistance
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相關(guān)代理商/技術(shù)參數(shù)
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