Squelch detection method and circuit using dual rectifying circuit for detecting out-of-band signal
US8760196B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 2011 |
| Grant date | Jun 24, 2014 |
| Priority date | — |
| Expiry date | Jun 18, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45648
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A circuit for detecting out-of-band signals is disclosed. In one embodiment, the circuit includes a first differential circuit configured to level shift and positively rectify a differential input signal to produce a first output component of a differential output signal. The detector further includes a second differential circuit configured to level shift and negatively rectify the differential input signal to produce a second output component of the differential output signal. A third differential circuit is configured to level shift and output first and second fixed voltages based on an input reference voltage and a ground voltage. The circuit is configured to provide the differential output signal and the first and second fixed voltages to an indicator circuit configured to assert an indication responsive to detecting that a differential voltage of the differential output signal is greater than a differential voltage of the first and second fixed voltages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.