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CS3012-IS

Precision Low-voltage Amplifier; DC to 1 kHz

Cirrus Logic 

CS3011

CS3012

Vin

Cin

50 pF

Vo

50 pF

Cin

R2

R1

Choose C2 so that R2 • C2 ≥ R? 1 • Cin

C2

Figure 16. Non-Inverting Gain Configuration with Compensation

The feedback capacitor C2 is required for closed- duces a pole and a zero in the loop gain transfer

loop gains greater than 50 V/V. The capacitor intro- function.

T

=

-–---⎝⎛--1-----+------z--s---1---⎠⎞-

⎛

⎝

1

+

-p-s--1⎠⎞

Ao

l

P1

=

2----π----(--R----1----1|-|---R----2---)--C----2-

≅

------------1------------

2π(R1C2)

for

R2 » R1

Z1

=

-----------------1------------------

2π(A × R1)C2

where

A = -R----2

R1

Z1

=

------------1------------

2π(R2)C2

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).

DS597F5

11

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