Symmetrical electrical physical layer activity detector
US8138802B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 14, 2011 |
| Grant date | Mar 20, 2012 |
| Priority date | — |
| Expiry date | Jul 14, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/45
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A low-current differential signal activity detector circuit may be configured to reject large common mode signals on differential input lines, while still detecting smaller differential signals applied to the same set of differential input lines. The detector circuit may comprise a translinear buffer that is driven at the buffer input and at the buffer output by the differential input signals. The differential signal thereby driving the inputs of the detector circuit may be half-wave rectified through the buffer output devices and may be filtered to provide the detected output. When applying a common mode signal, the buffer's input and output may track each other, and no current may be rectified in the output devices, thus providing common-mode signal rejection. The detector circuit may also be configured with two buffers having their outputs coupled to a common node, each buffer input driven by a respective one of the differential input signals. The differential signal thereby driving the inputs of the detector circuit may be fully rectified through the output devices of the two buffers, and may be filtered to provide the detected output. The two buffers may be configured in a sym…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.