參數(shù)資料
型號(hào)： TS615
廠商： 意法半導(dǎo)體
英文描述： DUAL WIDE BAND OPERATIONAL AMPLIFIER WITH HIGH OUTPUT CURRENT
中文描述： 雙寬帶運(yùn)放的大輸出電流
文件頁(yè)數(shù)： 24/27頁(yè)
文件大小： 982K
代理商： TS615
TS615
24/27
CHOICE OF THE FEEDBACK CIRCUIT
Table 71 :
Closed-Loop Gain - Feedback Compo-
nents
INVERTING AMPLIFIER BIASING
In this case a resistance is necessary to achieve a
good input biasing, as R on (fig.30).
This resistance is calculated by assuming the neg-
ative and positive input bias current. The aim is to
make the compensation of the offset bias current
which could affect the input offset voltage and the
output DC component. Assuming Ib-, Ib+, R
in
, R
fb
and a zero volt output, the resistance R comes: R
= R
in
// R
fb
.
Figure 72 :
Compensation of the Input Bias
Current
ACTIVE FILTERING
Figure 73 :
Low-Pass Active Filtering. Sallen-Key
The resistors R
fb
and R
G
give directly the gain of
the filter as a classical non-inverting amplification
configuration :
Assuming the following expression as the re-
sponse of the system:
the cutoff frequency is not gain dependent and it
comes:
the damping factor comes:
1
2
ω
cC1R1
The higher the gain the more sensitive the damp-
ing factor is. When the gain is higher than 1 it is
preferable to use some very stable resistors and
capacitors values.
In the case of R1=R2:
V
CC
(V)
Gain
+1
+2
+4
+8
-1
-2
-4
-8
+1
+2
+4
+8
-1
-2
-4
-8
R
fb
(
)
750
680
620
510
680
680
620
510
1.1k
1k
910
680
1k
1k
910
680
±6
±2.5
R
Load
Output
R
fb
R
in
Ib-
Ib+
Vcc+
Vcc-
TS615
+
_
+
_
R
G
IN
910
TS615
25
OUT
R
1
R
2
C
2
C
1
R
fb
AV
g
1
Rg
+
=
=
Tj
ω
ω
ω
Vinj
1
2
ζ
ω
ω
c
-j
ω
-j
(
)
2
2
ω
c
+
+
---------------------g
=
=
ω
c
R1R2C1C2
----------------1
=
ζ
C1R2
C2R1
C1R1g
–
+
+
)
=
ζ
2C2
---------------------------Rg
C1
Rfb
–
2 C1C2
=
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TS615_04 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:DUAL WIDE BAND OPERATIONAL AMPLIFIER WITH HIGH OUTPUT CURRENT
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TS615P 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:DUAL WIDE BAND OPERATIONAL AMPLIFIER WITH HIGH OUTPUT CURRENT
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TS616_07 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:Dual wide band operational amplifier with high output current
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