Radio frequency envelope detector
US7375578B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 29, 2004 |
| Grant date | May 20, 2008 |
| Priority date | — |
| Expiry date | Aug 18, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/08
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An RF envelope detection circuit that operations at low currents, high sensitivity, and high dynamic range. The circuit receives an AC signal at its input terminal and applies a signal on its output terminal that is a function of the envelope magnitude of the AC signal. To do so, a current source provides a current with an AC signal being superimposed thereon. A rectification circuit rectifies the AC component of this current. A voltage amplifier then amplifies the voltage for providing on the output terminal of the detection circuit. A current sink draws a current from the output terminal that has approximately the same magnitude as the current provided by the current source. A capacitor is coupled to the output terminal of the rectifier so as to store excess charge provided by the rectifier that is in excess of the magnitude of the current provided by the current source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.