| 摘要 |
PURPOSE:To obtain a 2nd order filter circuit to be easily manufactured and designed by constituting the filter circuit by a couple of input terminals receiving signals different in phase, 1st and 2nd impedance circuits comprising a capacitor and a coil and a 3rd impedance circuit comprising a resistor. CONSTITUTION:Signals different in phase by 180 deg. are supplied to a couple of input terminals 10A, 10B, the input terminal 10A is connected to an output terminal 20A via an impedance circuit 1 and the input terminal 10B is connected to the output terminal 20A via an impedance circuit 2. Moreover, the output terminal 20A is connected to ground via the impedance circuit 3. The filter circuit 30 is a 2nd order filter circuit. Since the filter circuit 30 has no mutual inductance, the manufacture and the design are easily attained. Then the filter is suitable for an all pass filter.
|
