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CS3011 датащи(PDF) 11 Page - Cirrus Logic

номер детали CS3011
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 датащи(HTML) 11 Page - Cirrus Logic

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CS3011
CS3012
DS597F6
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 th e loop gain transfer
function.
This indicates that the sep aration of the pole and
the zero is governed by the closed loop gain. It is
required that th e ze ro falls o n the steep slo pe
(–100 dB/decade) of the loop ga in plot so that
there is some gain higher than 0 dB (typically 20
dB) at the ha nd-over frequency (the frequ ency 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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