Efficient polyphase filter having a compact structure
US7190942B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | May 14, 2002 |
| Grant date | Mar 13, 2007 |
| Priority date | — |
| Expiry date | Mar 10, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H7/18
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Disclosed are systems and methods which provide phase shifting of signals while minimizing signal attenuation associated with providing such phase shifting. Preferred embodiments provide a compact polyphase filter structure in which the geometry of the polyphase filter both minimizes parasitic capacitance and signal transmission paths therein. A polyphase filter of a preferred embodiment utilizes a radial pinwheel structure providing a geometry in which successive circuit components are disposed very near one another and in an orientation to accommodate very short connections therebetween. Embodiments may include the use of a buffer at the outputs of the polyphase filter circuit to reduce the amount of parasitics associated with the polyphase filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.