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參數(shù)資料
| 型號(hào)： | THS4031JG |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 100-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS |
| 中文描述： | 100 MHz的低噪聲高速放大器 |
| 文件頁數(shù)： | 22/38頁 |
| 文件大小： | 674K |
| 代理商： | THS4031JG |
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THS4031, THS4032
100-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS
SLOS224C – JULY 1999 – REVISED APRIL 2000
22
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 45 shows the noise figure graph for the THS403x.
10
6
2
0
10
100
Source Resistance –
N
12
14
NOISE FIGURE
vs
SOURCE RESISTANCE
16
1 k
10 k
8
4
f = 10 kHz
TA = 25
°
C
Figure 45. Noise Figure vs Source Resistance
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| THS4032 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:100-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS |
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