Differential signal detector methods and apparatus
US7157944B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 27, 2004 |
| Grant date | Jan 2, 2007 |
| Priority date | — |
| Expiry date | Apr 27, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R19/16566
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Circuitry and methods allow signal detection based entirely on differential voltage pairs. An incoming differential data signal is processed by separate full-wave rectifiers to extract high and low peak voltage envelopes. The rectifiers utilize negative feedback to ensure accurate envelope detection, and can detect peaks regardless of incoming signal polarity. The extracted envelopes are compared to a differential pair of threshold voltages. If the envelope signals have a smaller voltage difference than that of the threshold signals, the final output of the detector indicates that a loss-of-signal condition has occurred. Fully differential operation makes the detector independent of common-mode voltage, and thus more robust.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.