Cutoff frequency 48dB-octSCF low-pass filter circuit

In order to obtain wax dB / oct low pass filter of Butterworth times, the four 12dB / oct (2-order filter) block were four series, in order to obtain the flat characteristics of tanks, the opening value at all levels will be distribution,
Cutoff frequency 48dB-octSCF low-pass filter circuit - schematic

the value of the circuit from the mouth small block start sequence, they worked out the parameters of heart SCF disadvantage is that the output clock signal is multiplied, so SlN deteriorate, additional input signal frequency will close off the clock frequency Diego, noise, the output, the input circuit must be added to a low-pass filter. This circuit uses a simple passive filters to improve the S / N, if the input signal has a very wide frequency spectrum shall be added to the positive regulation of active filter. Determined cutoff frequency. The clock frequency can lead to 12 to select, lead wire connected to + sv 12, the required clock frequency 50j inches, when connected ov, need 100f. The upper limit of the clock frequency is iMHz, so it is easy to form 20 kHz h. 1, the low-pass filter.

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