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TL441-EP_14 Datasheet, PDF (14/19 Pages) Texas Instruments – LOGARITHMIC AMPLIFIER | |||
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TL441ÄEP
LOGARITHMIC AMPLIFIER
SGLS268 â OCTOBER 2004
2 kâ¦
2 kâ¦
Input
A
Origin
â
+
20 kâ¦
Slope
+
â
A1 1/2 Y
A2 TL441 Y
Output
W
2 kâ¦
2 kâ¦
NOTE: Adjust the slope to correspond to the base âaâ. Exponential to any base: W = a.
Figure 17. Raising a Fixed Number to a Variable Power
Input
1
50 â¦
Input
2
50 â¦
TL592
+
â
50 â¦
Open
0.2 µF
Gain Adj. = 400 â¦
For 30 dB
TL592
+
â
50 â¦
Open
0.2 µF
A1
Y
A2
Y
TL441
Z
B1
B2
Z
CA2 CA2â CB2 CB2â
10
10
kâ¦
kâ¦
Gain Adj. = 400 â¦
For 30 dB
2.2 kâ¦
20 kâ¦
2.2 kâ¦
2.2 kâ¦
20 kâ¦
2.2 kâ¦
TL592
+
â
0.2 µF
0.2 µF
Output
1
1 kâ¦
Gain Adj.
TL592
+
â
0.2 µF
0.2 µF
1 kâ¦
Output
2
1 kâ¦
Gain Adj.
1 kâ¦
VCC â
Figure 18. Dual-Channel RF Logarithmic Amplifier With 50-dB Input Range Per Channel at 10 MHz
14
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