參數(shù)資料
型號(hào): THS4051FK
廠商: Texas Instruments, Inc.
英文描述: 70-MHz HIGH-SPEED AMPLIFIERS
中文描述: 70 - MHz的高速放大器
文件頁(yè)數(shù): 16/30頁(yè)
文件大?。?/td> 487K
代理商: THS4051FK
THS4051, THS4052
70-MHz HIGH-SPEED AMPLIFIERS
SLOS238C– MAY 1999 – REVISED MAY 2000
16
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
eRs
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 kTRS
Figure 44 shows the noise figure graph for the THS405x.
0
5
10
15
20
25
30
35
40
NOISE FIGURE
vs
SOURCE RESISTANCE
Source Resistance -
N
100
1k
10k
10
100k
f = 10 kHz
TA = 25
°
C
Figure 44. Noise Figure vs Source Resistance
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