參數(shù)資料
型號(hào): THS4082IDR
廠商: TEXAS INSTRUMENTS INC
元件分類(lèi): 音頻/視頻放大
英文描述: 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
封裝: GREEN, PLASTIC, SOIC-8
文件頁(yè)數(shù): 5/32頁(yè)
文件大小: 841K
代理商: THS4082IDR
THS4081, THS4082
175MHz LOW POWER HIGHSPEED AMPLIFIERS
SLOS274D DECEMBER 1999 REVISED JUNE 2001
13
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 )
e
n
2
) IN )
R
S
2
4kTR
S
Figure 40 shows the noise figure graph for the THS408x.
0
5
10
15
20
25
30
35
40
Source Resistance RS ()
f = 10 kHz
TA = 25°C
NOISE FIGURE
vs
SOURCE RESISTANCE
10
100
1k
10k
Noise
Figure
(dB)
100k
Figure 40. Noise Figure vs Source Resistance
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