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CS3002 датащи(PDF) 8 Page - Cirrus Logic

номер детали CS3002
подробное описание детали  PRECISION LOW VOLTAGE AMPLIFIER; DC TO 2KHZ
PDF  16 Pages
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производитель  CIRRUS [Cirrus Logic]
домашняя страница  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS3002 датащи(HTML) 8 Page - Cirrus Logic

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CS3001
CS3002
8
3.2
Open Loop Gain and Stability
Compensation
The CS3001 and CS3002 achieve ultra-high open
loop gain. Figure 10 illustrates the amplifier in a
non-inverting gain configuration. The open loop
gain and phase plots indicate that the amplifier is
stable for closed-loop gains less than 50 V/V. For a
gain of 50, the phase margin is between 40
° and 60°
depending upon the loading conditions. As shown
in Figure 11 on page 9, the op amp has an input ca-
pacitance at the + and – signal inputs of typically
50 pF. This capacitance adds an additional pole in
the loop gain transfer function at a frequency of
f= 1/(2
πR*Cin) where R is the parallel combina-
tionof R1and R2 (R1
|| R2). A higher value for R
produces a pole at a lower frequency, thus reducing
the phase margin. R1 is recommended to be less
than or equal to 100 ohms, which results in a pole
at 30 MHz or higher. If a higher value of R1 is de-
sired, a compensation capacitor (C2) should be
added in parallel with R2. C2 should be chosen
such that R2*C2
≥ R1*C
in.
R1
R2
Vin
Vo
R
S
Figure 10. Non-Inverting Gain Configuration



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