| 摘要 |
PROBLEM TO BE SOLVED: To provide a poly-phase filter for generating a signal with 90°phase difference accurately as a phase shifter even if resistors and capacitors of the poly-phase filter constituted in a semiconductor integrated circuit vary, and enhancing an image suppression effect when used as an image elimination filter. SOLUTION: The poly-phase filter 35, in which a circuit network is composed of a plurality of capacitors and a plurality of resistors, includes a plurality of element groups constituted of capacitors C1, C2, C3, C4 and resistors R1, R2, R3, R4. Each of the capacitors C1, C2, C3, C4 is constituted of lower electrodes 1, 4, 6, 8, upper electrodes 2, 5, 7, 9 and an insulating layer 3 formed between electrodes. The resistors R1, R2, R3, R4 in each of the element groups are composed if the upper electrodes 2, 5, 7, 9 of the same element group. The resistors R1, R2, R3, R4 composed of the relevant upper electrodes 2, 5, 7, 9 are formed so that a length in a flowing direction of signals becomes sufficiently long with respect to the width direction. COPYRIGHT: (C)2009,JPO&INPIT
|
