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:
Oct. 19, 2004
Filed:
Feb. 20, 2002
Adolf Baumann, Bundesrepublik Deutschland, DE;
Harald Parzhuber, Bundesrepublik Deutschland, DE;
Texas Instruments Deutschland GmbH, Freising, DE;
Abstract
In a circuit assembly for generating pulses sustaining or “plucking” RF oscillations in a resonant circuit ( ) of transponder ( ) having no battery power supply in which the supply voltage needed for its operation is obtained from a RF carrier oscillation pulse defined in time exciting the resonant circuit into oscillation and used to charge a storage element whose charging voltage forms the supply voltage, a plucking pulse is generated every time the amplitude of the RF oscillations drops below a defined threshold value and its momentary value is in a defined relationship to a reference voltage (VPEAK) changing in time as the charging voltage of a capacitor ( ). A switch ( ) is provided which can be switched on for the duration of the plucking pulse (PLUCK) for connecting the storage element ( ) to the resonant circuit ( ). A closed control loop ( ) is provided which varies the slope of the reference voltage curve between two plucking (PLUCK) pulses in the direction of maintaining the predefined relationship between the momentary value of the RF oscillations and the reference voltage.