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CXA1352AS Arkusz danych(PDF) 9 Page - Sony Corporation |
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CXA1352AS Arkusz danych(HTML) 9 Page - Sony Corporation |
9 / 17 page —9— CXA1352AS Fig. 2. Indicates frequency characteristics at boost and cut. Fig. 2. • CXA1352AS system 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 Z (s) = 1 H(s) • Gm1 Response (dB) 0dB Boost FIat Cut fO= 2 π LC 1 Frequency (Hz) fO VI H(s)= s2+ s+ ωo2 Q ωo s Q ωo H(s) Ic Ib Z(s) Z(s) R R Gm1 Gm2 VO Operational amplifier |
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