CS3001(2002) 데이터 시트보기 (PDF) - Cirrus Logic

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CS3001
(Rev.:2002)

Precision Low Voltage Amplifier; DC to 2 kHz

Cirrus Logic 

CS3001

CS3002

V in

C in

50 pF

Vo

50 pF

C in

R2

R1

C h oo se C 2 so th at R 2C 2 ≥ R 1C in

C2

Figure 11. Non-Inverting Gain Configuration with Compensation

The feedback capacitor C2 is required for closed-

loop gains greater than 50 V/V. The capacitor in-

troduces a pole and a zero in the loop gain transfer

function,

T

=

–------1-----+-----z---s---1-----





1

+

p--s--1-

A

o

l

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).

P1 = -2---π----(--R----1----1|-|---R----2---)--C-----2 ≅ 2----π---(---R--1--1---C----2---)

for

R2 » R1

Z1

=

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

2π(A × R1)C2

where

A = R-----2

R1

9

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