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EC5822 데이터시트(PDF) 6 Page - E-CMOS Corporation

부품명 EC5822
상세설명  10MHz, Low-Power, CMOS, Rail-to-Rail Dual Operational Amplifier
PDF  12 Pages
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제조업체  E-CMOS [E-CMOS Corporation]
홈페이지  http://www.ecmos.com.tw/
Logo E-CMOS - E-CMOS Corporation

EC5822 데이터시트(HTML) 6 Page - E-CMOS Corporation

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10MHz, Low-Power, CMOS,
Rail-to-Rail Dual Operational Amplifier
EC5822
E-CMOS Corp. (www.ecmos.com.tw)
3K29N-Rev.P001
Page 6 of 12
Low Pass Active Filter
The low pass active filter is shown in Figure 8. The DC gain is defined by
–R2/R1. The filter has a -20dB/
decade roll-off after
its corner frequency ƒ
C=1/(2πR3C1).
Figure 8. Low Pass Active Filter
Sallen-Key 2
nd Order Active Low-Pass Filter
EC5822 can be used to form a 2
nd order Sallen-Key active low-pass filter as shown in Figure 9. The transfer
function from VIN to VOUT is given by
Where the DC gain is defined by ALP=1+R3/R4, and the corner frequency is given by
The pole quality factor is given by
Let R1=R2=R and C1=C2=C, the corner frequency and the pole quality factor can be simplified as below
And Q=2-R3/R4



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