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The fourth-order low -pass filter circuit with capacitor ele

2017-02-27 14:41  
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The fourth-order low -pass filter circuit with capacitor element
The figure shows a high-order low - pass filter circuit using a LM348 quad operational amplifier. For example fc = 20kHz, filter transfer coefficient H0 = 1, Q01 = 0.541, Q02 = 1.306. Because the amplification coefficient product calculation of filter in the pass band for the four amplifiers is identical, it is simply equipped with a current source (LM334Z), and precise adjustment can be carried out using the potentiometer RP.