Patent ID: 7405636
Filing Date: 2008-07-29
Classification: H03H

Abstract:
1. A passive polyphase filter comprising input nodes of m in number for inputting m-phase signals, resistors of m in number, capacitors of m in number, and output nodes of m in number for outputting m-phase signals, formed on a same board of an integrated circuit where m denotes an integer not less than 3, the resistors and the capacitors being connected alternately in a loop, the input nodes and the output nodes being connected alternately to the respective nodes between the resistors and the capacitors sequentially, wherein each of the resistors of m in number is composed of a group of partial resistors of at least (m-1) in number, where the partial resistors in (m-1) groups among the groups of m in number are collected for the respective groups and arranged in the same attitude, and partial resistors of the remaining one group are distributed into the other groups and arranged in the same arrangement and the same attitude as the partial resistors of each of the other groups, and regions of the thus collected groups are arranged in one direction.