P1K-2 Improvement of Balance Performance of SAW Filters by Common-Mode Signal Suppression

Author

Nakamura, Hiroyuki ; Tsuzuki, Shigeru ; Ishizaki, Toshio

Author_Institution

Panasonic Electron. Devices Co., Ltd., Osaka

fYear

2006

fDate

2-6 Oct. 2006

Firstpage

1486

Lastpage

1489

Abstract

A new design concept for improvement of balance performance of SAW filters has been investigated. The balance performance is degraded by common-mode signals in the balance terminals. The concept employed is the suppression of the common-mode signals using a common-mode signal suppression circuit, connected to the balanced terminals. In the circuit, the impedance of balance terminals for the differential-mode signals becomes open to the ground level by the resonance circuit. And, the impedance of balance terminals for the common-mode signals becomes short to the ground level. And, the circuit has an impedance matching scheme. The improvement in balance performance was confirmed. This design concept could be applied to the circuit design for balanced-type SAW filter circuit designs

Keywords

acoustic signal processing; circuit optimisation; surface acoustic wave filters; SAW filter balance performance; balance terminal impedance; balanced type SAW filter circuit design; common mode signal suppression; differential mode signals; impedance matching scheme; resonance circuit; Circuit synthesis; Coupling circuits; Degradation; Frequency; Impedance; Integrated circuit noise; RLC circuits; Resonance; SAW filters; Signal design;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 2006. IEEE

Conference_Location

Vancouver, BC

ISSN

1051-0117

Print_ISBN

1-4244-0201-8

Electronic_ISBN

1051-0117

Type

conf

DOI

10.1109/ULTSYM.2006.373

Filename

4152229