The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 20, 2003
Filed:
Nov. 08, 2001
Steve Schoenbauer, Colorado Springs, CO (US);
EM Microelectronics-US, Inc, Colorado Springs, CO (US);
Abstract
A receiver circuit ( ) for a contactless identification system, includes an antenna ( ). The antenna ) receives an amplitude modulated signal. A voltage envelope detector ( ) is connected to the antenna ( ). A current envelope detector ( ) is connected to the antenna ( ). A first comparator ( ) has a first input ( ) connected to an output of the voltage envelope detector ( ) and a second input ( ) connected to a threshold. A second comparator ( ) has a first input ( ) connected to an output of the current envelope detector ( ) and a second input ( ) connected to the threshold. A logic gate ( ) combines an output ( ) of the first comparator ( ) and an output ( ) of the second comparator ( ).