Texas Instruments Evaluation Board for the LMV832 3.3MHz EMI Hardened Operation Amplifier LMV832MMEVAL LMV832MMEVAL 데이터 시트
제품 코드
LMV832MMEVAL
RF INPUT PEAK VOLTAGE (dBVp)
EMI
R
R
V_PEAK
(d
B
)
140
130
120
110
100
90
80
70
60
50
40
30
20
-40
-30
-20
-10
0
10
1800 MHz
900MHz
400 MHz
2400 MHz
FREQUENCY (MHz)
EMI
R
R
V
_
PEAK
(
d
B
)
140
130
120
110
100
90
80
70
60
50
40
30
20
10
100
1000
10000
125°C
85°C
-40°C
25°C
V
+
= 3.3V, 5.0V
V
PEAK
= -20 dBVp
Measurement Results
Figure 1. EMIRR vs. Frequency
7.2
EMIRR Vs. Power
shows the EMIRR as a function of power at four typical frequencies.
Figure 2. EMIRR vs. Power
In this figure two areas can be distinguished. At the left side of the figure, the EMIRR increases as a
function of input level; whereas at the right side the EMIRR decreases as a function of the input level.
function of input level; whereas at the right side the EMIRR decreases as a function of the input level.
The left side of the figure is actually an artifact resulting from the limited accuracy of the measurement
setup. For the relatively low input levels, the resulting offset voltage shift is well below the noise level.
Thus, when calculating the EMIRR for that region, the ratio of the input level to the noise level is depicted.
As the noise level is constant for the setup, an increasing EMIRR is obtained for increasing input signal
level.
setup. For the relatively low input levels, the resulting offset voltage shift is well below the noise level.
Thus, when calculating the EMIRR for that region, the ratio of the input level to the noise level is depicted.
As the noise level is constant for the setup, an increasing EMIRR is obtained for increasing input signal
level.
For the right side, the obtained offset-shift is well above the noise level. As the relation between offset
voltage shift and RF input level is quadratic, the ratio as used in the EMIRR is inversely proportional to the
RF input level, which is in line with the displayed slope of “
voltage shift and RF input level is quadratic, the ratio as used in the EMIRR is inversely proportional to the
RF input level, which is in line with the displayed slope of “
−
1”.
3
SNOA530A – October 2008 – Revised April 2013
AN-1867 EMIRR Evaluation Boards for LMV831/LMV832/LMV834
Copyright © 2008–2013, Texas Instruments Incorporated