| 摘要 |
PROBLEM TO BE SOLVED: To realize a polyphase filter by using minimum capacity elements and active circuits, and a smaller number of resistance elements. SOLUTION: The polyphase filter is equipped with 1st and 2nd networks, including 1st and 2nd input/output terminals, buffer circuits, capacitors, and resistances. The 1st network 1 shows low-pass characteristics to a signal from a 1st input terminal and high-pass signal to a signal from a 2nd input terminal. The 2nd network 2 shows high-pass characteristics to the signal from the 1st input terminal and low-pass characteristics to the signal from the 2nd input terminal. One of transfer functions, showing the low-pass characteristics or high-pass characteristics of the 1st network 1, has the same polarity as with a transfer function, showing the low-pass characteristics or high-pass characteristics of the 2nd network 2, and the other transfer function of the 1st network has a polarity inverted from the transfer function of the 2nd network. COPYRIGHT: (C)2005,JPO&NCIPI
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