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CS3011-IS датащи(PDF) 11 Page - Cirrus Logic

номер детали CS3011-IS
подробное описание детали  Precision Low-voltage Amplifier; DC to 1 kHz
PDF  18 Pages
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производитель  CIRRUS [Cirrus Logic]
домашняя страница  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS3011-IS датащи(HTML) 11 Page - Cirrus Logic

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CS3011
CS3012
DS597F5
11
The feedback capacitor C2 is required for closed-
loop gains greater than 50 V/V. The capacitor intro-
duces a pole and a zero in the loop gain transfer
function.
This indicates that the separation of the pole and
the zero is governed by the closed loop gain. It is
required that the zero falls on the steep slope
(–100 dB/decade) of the loop gain plot so that
there is some gain higher than 0 dB (typically 20
dB) at the hand-over frequency (the frequency at
which the slope changes from – 100 dB/decade to
–20 dB/decade).
50 pF
50 pF
R1
R2
Vin
Vo
C2
Cin
Cin
Choose C2 so that R2
• C2 ≥
?
R1
• Cin
Figure 16. Non-Inverting Gain Configuration with Compensation
T
1
s
z
1
-----
+
⎝⎠
⎛⎞
–
1
s
p
1
-----
+
⎝⎠
⎛⎞
-----------------------A
ol
=
P
1
1
2
π R
1
R
2
||
()C
2
-------------------------------------
1
2
π R
1C2
()
-------------------------
≅
=for
R
2
R
1
»
Z
1
1
2
π AR
1
×
()C
2
-----------------------------------
=where
A
R
2
R
1
------
=
Z
1
1
2
π R
2
()C
2
-------------------------
=



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