System and method for providing a low power low voltage data detection circuit for RF AM signals in EPC0 compliant RFID tags
US7579906B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 2005 |
| Grant date | Aug 25, 2009 |
| Priority date | — |
| Expiry date | Nov 28, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D1/18
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A system and method is disclosed for demodulating RF amplitude modulated signals in a demodulator circuit of an EPC0 compliant RFID tag. One advantageous embodiment of the invention comprises first and second input ports, a +ve envelope detector circuit for each of the first and second input ports, a −ve envelope detector circuit for each of the first and second input ports, a +ve envelope differentiator circuit, a +ve low pass filter, a −ve envelope differentiator circuit, a −ve low pass filter, and a zero crossing detector. The zero crossing detector detects a transition in the RF input signal using a voltage difference between a +ve filtered differentiated envelope signal and a −ve filtered differentiated envelope signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.