參數(shù)資料
型號(hào): THS4021EVM
廠商: Texas Instruments, Inc.
英文描述: 350-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS
中文描述: 350 - MHz的低噪聲高速放大器
文件頁數(shù): 11/22頁
文件大?。?/td> 366K
代理商: THS4021EVM
THS4021, THS4022
350-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS
SLOS265B – SEPTEMBER 1999 – REVISED FEBRUARY 2000
11
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 32 shows the noise figure graph for the THS402x.
Source Resistance –
N
NOISE FIGURE
vs
SOURCE RESISTANCE
0
2
4
6
8
10
12
14
16
10
100
1000
1 k
10000
10 k
f = 10 kHz
TA = 25
°
C
Figure 32. Noise Figure vs Source Resistance
相關(guān)PDF資料
PDF描述
THS4022D 350-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS
THS4022DGN 350-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS
THS4022EVM 350-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS
THS4031D 100-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS
THS4031JG 100-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS
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