| 摘要 |
PURPOSE:To minimize the static capacity value of a capacitor by forming the attenuating pole at the upper side of a pass band by the capacitor connected by straddling an infinite frequency pole band-pass filter and a linking capacitor. CONSTITUTION:A band-pass filter circuit 10 includes an input edge 12 and an output edge 14 and between the input edge 12 and the output edge 14, a zigzag-shaped infinite frequency pole band-pass filter 16 is connected. The input of the filter 16 and the input edge 12 are connected and between the output of the filter 16 and the output edge 14, a linking capacitor C13 is connected. Between the input edge 12 and the output edge 14, another capacitor C14 is connected by straddling the infinite frequency pole band-pass filter 16 and the linking capacitor C13. The capacitor C14 forms the attenuating pole at the upper side of the pass band.
|
