Imbalanced differential circuit control
US7230503B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 2, 2002 |
| Grant date | Jun 12, 2007 |
| Priority date | — |
| Expiry date | Jun 4, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J2200/10
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A differential circuit includes first and second side circuits which are coupled to receive control signals in such a way as to introduce an intentional imbalance in the differential circuit for certain benefits discussed herein. An exemplary pseudo-differential LC tank circuit is described which includes first and second side nodes, and an inductance circuit and a variable capacitance circuit coupled between the nodes. The inductance and variable capacitance circuits may be broken out into separate tanks to achieve certain magnetic noise reduction benefits. Each exemplary variable capacitance circuit includes a first variable capacitance coupled between the first side node and a common ground node, and a second variable capacitance coupled between the second side node and the common ground. Each of the first and second variable capacitances is coupled to receive control lines for controlling the capacitance of the first and second variable capacitance circuits in a pseudo-differential manner. Each variable capacitance includes at least one of many types of switch-capacitor cells, some of which are described herein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.