Low-voltage differential signal activity detector
US8988112B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 14, 2012 |
| Grant date | Mar 24, 2015 |
| Priority date | — |
| Expiry date | Jul 11, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K5/1534
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An activity detector for a differential signal formed by two components may include a current source connected to a power supply line, and a first transistor has a drain being powered by the current source, and has a source that forms a first input terminal receiving a first component of the differential signal. A second transistor has a drain being powered by the current source, and has a source forms a second input terminal receiving the second component of the differential signal. A bias circuit applies a potential to the gates of the first and second transistors, establishing a balance condition where all the current from the current source is distributed between the two transistors when the first and second input terminal potential is equal to a threshold value. An activity indication terminal is taken from the drains of the first and second transistors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.