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Fourth-order low-pass filter circuit

2017-02-15 10:31  
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Fourth-order low-pass filter circuit
The figure shows a circuit which uses a high-level low-pass filter composed of a piece of LM348 four-operational amplifier. For example, if fc = 20kHz, filter transferring coefficient is counted as H0 = 1, Q01 = 0.541, Q02 = 1.306. Only one current source (LM334Z) is needed to be equipped with the filter because this filter can lead to the same product calculation for four amplifiers within band-pass amplification factor. Potentiometers RP can be used for precision adjustment.