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EC5721 bảng dữ liệu(PDF) 6 Page - E-CMOS Corporation

tên linh kiện EC5721
Giải thích chi tiết về linh kiện  1MHz, Low Power, CMOS, Rail-to-Rail Operational Amplifier
PDF  13 Pages
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nhà sản xuất  E-CMOS [E-CMOS Corporation]
Trang chủ  http://www.ecmos.com.tw/
Logo E-CMOS - E-CMOS Corporation

EC5721 bảng dữ liệu(HTML) 6 Page - E-CMOS Corporation

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1MHz, Low Power, CMOS,
Rail-to-Rail Operational Amplifier
EC5721
E-CMOS Corp. (www.ecmos.com.tw)
3L23N-Rev.P001
Page 6 of 13
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 2nd Order Active Low-Pass Filter
EC5721 can be used to form a 2nd 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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