| 摘要 |
PURPOSE:To provide use high pass filter for impulse employing an analog circuit using resistors and capacitors to recover a trailing edge of an impulse rapidly. CONSTITUTION:The filter is provided with an input high pass filter 1 with capacitors and resistors having a higher cut-off frequency than a required cut-off frequency, a compensation signal generating circuit generating a compensation signal for an amplitude difference in a step response characteristic of the high pass filter 1 with respect to an object step response characteristic in which a time from a slope of a step response characteristic of the required cut-off frequency to a zero level is halved, and an adder circuit A5 for an output signal of the high pass filter 1 and the compensation signal. The compensation signal generating circuit is provided with a 1st integration circuit 2 for the output signal of the high pass filter 1 and a 2nd integration circuit 3 for the output terminal, the 2nd output signal is fed back to a terminal opposite to the input terminal of the integration capacitor of the 1st integration circuit 2 to adjust the amplitude and generation of the compensation signal through the reduction of the output signal of the 2nd integration circuit from the output signal of the 1st integration circuit. |
