| 摘要 |
PURPOSE: A circuit for improving a filter characteristic using a notch filter is provided to maintain a flat gain and satisfy a margin of 30dBc by using the notch filter. CONSTITUTION: A filter characteristic improving circuit is formed with a source portion(100), a low pass filter portion(200), a notch filter portion(300), and a waveform output portion(400). The source portion(100) generates a square wave. The low pass filter portion(200) performs a lower filtering process for the square wave of the source portion(100). The low pass filter portion(200) is formed with a butter worth filter. The notch filter portion(300) removes harmonic components from the waveform passing the low pass filter portion(200). The waveform output portion(400) outputs the waveform filtered by the notch filter portion(300). |
