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TS616 数据表(PDF) 24 Page - STMicroelectronics

部件名 TS616
功能描述  DUAL WIDE BAND OPERATIONAL AMPLIFIER WITH HIGH OUTPUT CURRENT
PDF  27 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

TS616 数据表(HTML) 24 Page - STMicroelectronics

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TS616
24/27
ACTIVE FILTERING
Figure 67: Low-Pass Active Filtering. Sallen-Key
The resistors Rfb and RG give the gain of the filter
as a classical non-inverting amplification configu-
ration :
Assume the following expression is the response
of the system:
the cut-off frequency is not gain-dependent and it
becomes:
The damping factor becomes:
The higher the gain, the more sensitive the damp-
ing factor is. When the gain is higher than 1 it is
preferable to use very stable resistors and capac-
itances values.
In the case of R1=R2:
INCREASING THE LINE LEVEL BY USING AN
ACTIVE IMPEDANCE MATCHING
With passive matching, the output signal ampli-
tude of the driver must be twice the amplitude on
the load. To go beyond this limitation, active
matching impedance can be used. With this tech-
nique, it is possible to keep good impedance
matching with an amplitude on the load higher
than half of the output driver amplitude. This con-
cept is shown in Figure 68 for a differential line.
Figure 68: TS616 as a differential line driver with
an active impedance matching
+
_
RG
IN
Rfb
910
Ω
TS616
25
Ω
OUT
R1
R2
C2
C1
+
_
RG
IN
Rfb
910
Ω
TS616
25
Ω
OUT
R1
R2
C2
C1
A
V
g1
R
fb
R
g
----------
+
==
T
j
ω
Vout
j
ω
Vin
j
ω
-------------------
g
12
ζ
j
ω
ω
c
-------
j
ω
()
2
ω
c
2
--------------
++
---------------------------------------------
==
ω
c
1
R1R2C 1C2
--------------------------------------
=
ζ
1
2
---
ω
c
C
1
R
1
C
1
R
2
C
2
R
1
C
1
R
1
g
–
++
()
=
ζ
2C
2
C
1
R
fb
R
g
----------
–
2C
1
C
2
------------------------------------
=
R4
R2
Vi
Vi
Vo
Vo
RL
100
Ω
1:n
Hybrid
&
Transformer
GND
Vcc+
10
µ
100n
100n
100n
1k
1k
Rs1
Rs2
10n
1
µ
R3
R5
Vo°
Vo°
GND
Vcc+
Vcc+
+
_
+
_
GND
1/2
R1
1/2
R1
Vcc/2



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