Apparatus and method for enhancing the isolation of an MMIC cross-point switch
US6265953A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 24, 1999 |
| Grant date | Jul 24, 2001 |
| Priority date | — |
| Expiry date | Jun 24, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q3/521
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A fully monolithic cross-point switch matrix overcomes the isolation problems between unconnected ports of the prior art. An Isolation Enhancement Network (IEN) is connected between each of the input and output transmission lines at each of the cross-points. The switch matrix is comprised of a tiled interconnection of M.times.N of the 1.times.1 switch/IEN (SIEN) cells, where N and M are the number of input and output ports respectively. Each of the SIEN cells can be independently configured into one of two operating modes, connected or unconnected. The switching element is configured to provide a high isolation path between the input and output lines in the unconnected mode of operation. In this case, a small fraction of the input signal injected at the input port appears at the output port. This output signal is comprised of two components. The first component arises from a number of stray coupling mechanisms between the input and output lines but does not include the portion of the input signal which passes through the IEN. The dominant area of this stray coupling occurs at the point where the input and output transmission lines cross. The second component of the output signal is…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.