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The Butterworth 4-stage switch capacitor low-pass filter (TL

2017-02-27 22:25  
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The Butterworth 4-stage switch capacitor low-pass filter (TLC04)
The filter circuit is shown in figure 5. The main part of the filter circuit consists of the Butterworth 4-stage switch capacitor low-pass filter (TLC04) which is produced by TI Corp., US, and the self-timing dual power supply of Schmidt trigger oscillator is the power supply. The stability of TLC04 blocking frequency is only related with the clock frequency stability, the blocking frequency clock is adjustable, the clock-blocking frequency ratio is 50:1, so the designed blocking frequency is 1/1.69×RF1×CF1×50=251.8Hz, which satisfies the requirements of oscillating aging and oscillating wielding technique.