Invention Application
WO2005022744A1 METHOD AND SYSTEM FOR PASSBAND RIPPLE CANCELLATION IN CASCADING FILTERS
审中-公开
滤波器中通带纹波消除的方法与系统
- Patent Title: METHOD AND SYSTEM FOR PASSBAND RIPPLE CANCELLATION IN CASCADING FILTERS
- Patent Title (中): 滤波器中通带纹波消除的方法与系统
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Application No.: PCT/IB2004/051594Application Date: 2004-08-28
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Publication No.: WO2005022744A1Publication Date: 2005-03-10
- Inventor: FAN, Yiping
- Applicant: KONINKLIJKE PHILIPS ELECTRONICS, N.V. , U.S. PHILIPS CORPORATION , FAN, Yiping
- Applicant Address: Groenewoudseweg 1, NL-5621 BA Eindhoven NL
- Assignee: KONINKLIJKE PHILIPS ELECTRONICS, N.V.,U.S. PHILIPS CORPORATION,FAN, Yiping
- Current Assignee: KONINKLIJKE PHILIPS ELECTRONICS, N.V.,U.S. PHILIPS CORPORATION,FAN, Yiping
- Current Assignee Address: Groenewoudseweg 1, NL-5621 BA Eindhoven NL
- Agency: KONINKLIJKE PHILIPS ELECTRONICS, N.V.
- Priority: US60/498,455 20030828
- Main IPC: H03H7/06
- IPC: H03H7/06
Abstract:
A composite filter (200) includes at least two cascading filters (202, 204) designed to minimize a passband ripple in the composite filter (200). The at least two cascading filters (202, 204) may also be designed to maximize stopband rejection in the composite filter (200). Filter characteristics, such as the order, bandwidth, stopband attenuation, and ripple magnitude, for the cascading filters (202, 204) are selected in order to achieve minimal passband ripple and maximum stopband rejection in the composite filter (200). The passband ripple in the composite filter (200) is minimized or cancelled by having the passband ripple in the cascading filters (202, 204) be equal or nearly equal in magnitude but out of phase with respect to each other.
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