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CS3002 Datenblatt(PDF) 9 Page - Cirrus Logic

Teilenummer CS3002
Bauteilbeschribung  Precision Low-voltage Amplifier; DC to 2 kHz
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Hersteller  CIRRUS [Cirrus Logic]
Direct Link  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS3002 Datenblatt(HTML) 9 Page - Cirrus Logic

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CS3001
CS3002
DS490F8
9
3.2
Open-loop Gain and Stability Compensation
3.2.1
Discussion
The CS3001 and CS3002 achieve ultra-high open
loop gain. Figure 16 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 and
R1
≤ 100 Ohms. For a gain of 50, the phase margin
is between 40
° and 60° depending upon the loading
conditions. As shown in Figure 17, on page 12, the
operational amplifier has an input capacitance 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 combination of R1 and 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 desired, 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 16. Non-inverting Gain Configuration


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