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Low Power Consumption Band-Stop Filter Circuit

2014-11-28 06:02  
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Low Power Consumption Band-Stop Filter Circuit
Low Power Consumption Band-Stop Filter Circuit
In this circuit the ratio of R6 and R7 would determine the amplification factor Voo in very low frequency. If Vo=1, then the R7 can be cancelled in practice.The selection principle of each elements in this circuit is listed in the picture 2. 500kΩ>R1=R2>1kΩ.0.5uF>C1=C2>200pF.From R1=R2, it has the conclusion that R3=0.5R1. From C1=C2, it has the conclusion that C3=2C1.The quality factor Q=f0/b (-3dB get the point b).It selects R4≈R5=4Q/wC3 and C4=C3/2Q.For example: f0=450Hz, b=250Hz, R1=R2=47kΩ, it has that C1=C2=1/2πf0R=1/2π*450*47*10^3=7.52nF.R3=0.5*4.7kΩ=23.5kΩ.And C3=2C1=15nF.Q=f0/b=450/250=1.8.R4≈R5=4Q/wC3=4*1.8/2π*450*15*10^-9=169kΩ.