CXA1352AS 데이터 시트보기 (PDF) - Sony Semiconductor

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CXA1352AS

2-channel 5 Elements Graphic Equalizer IC

Sony Semiconductor 

Fig. 2. Indicates frequency characteristics at boost and cut.

Response (dB)

Boost

CXA1352AS

0dB

• CXA1352AS system

VI

ωo s

Q

H(s)= s2+ ωo s+ωo2

Q

FIat

Cut

fO

Fig. 2.

fO= 1

2π LC

Frequency (Hz)

R

Operational amplifier

VO

R

Z(s)

Z(s)

H(s)

Ic

Gm1

Ib

Gm2

Fig. 3.

The structure of the graphic equalizer used in this IC is shown on Fig. 3. This circuit performs boost and

cut controlled by 2 transconductance amplifiers that can vary the conversion coefficient through control

currents Ib, and Ic around ωo. (“ωo” is central frequency determined by Band Pass Filter.) Considering

output impedance Z (s) of Gm1, Gm2 we have

1

Z (s) =

H(s) • Gm1

—9—

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