Current location - Plastic Surgery and Aesthetics Network - Plastic surgery and beauty - After filtering, the falling edge of the circuit pulse becomes flat. What happened?
After filtering, the falling edge of the circuit pulse becomes flat. What happened?
1) pulse signal is rich in high-frequency harmonics, but your simple filter circuit has insufficient bandwidth to filter out the needed harmonics, just like a square wave becomes a triangular wave after passing through an RC circuit, so to broaden the bandwidth of this filter, it is necessary to reduce the time constant;

2) Usually, the pulse signal does not need a filter, but a shaping circuit, such as a comparator circuit;