參數(shù)資料
型號(hào)： THS7002PWP
廠商： Texas Instruments, Inc.
英文描述： 70-MHz PROGRAMMABLE-GAIN AMPLIFIERS
中文描述： 70 - MHz的可編程增益放大器
文件頁(yè)數(shù)： 17/32頁(yè)
文件大?。?/td> 597K
代理商： THS7002PWP
THS7001, THS7002
70-MHz PROGRAMMABLE-GAIN AMPLIFIERS
SLOS214B – OCTOBER 1998 – REVISED AUGUST 1999
17
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
noise calculations and noise figure (continued)
RF1
A1
+
Vin
_
_
+
RG1
RF2
RG2
eni1
+
eno1
eni2
eno2
AV1= 1+
RF1
RG1
AV2= 1+
RF2
RG2
Figure 53. Simplified Composite Amplifier System
The noise due to amplifier 1 (A1) is the same as derived in equations 1 and 2. The composite system noise is
calculated as follows:
eno2
eni2
2
eno1
2
AV2
(3)
eni2
2
eni1AV1
2
AV2
In a typical system, amplifier 1 (A1) has a large gain (A
V1
). Because the noise is summed in the RMS method,
if the A1 output noise is more than 25% larger than the input noise of amplifier 2, the contribution of
amplifier 2’s input noise to the composite amplifier output noise can effectively be ignored. This reduces
equation 3 down to:
(4)
eno2
eni1AV1AV2
Equation 4 shows that the very first amplifier (the preamplifier) is critical in any low-level signal system. This also
shows that practically any noisy amplifier can be used after the preamplifier with minimal SNR degradation.
For more information on noise analysis, please refer to the Noise Analysissection in Operational Amplifier
Circuits Applications Report (literature number SLVA043).
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
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