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:
Jun. 06, 2006
Filed:
Nov. 01, 2002
Matthijs D. Pardoen, Sunnyvale, CA (US);
János Erdélyi, Dunakeszi, HU;
Attila Zólomy, Budapest, HU;
Ferenc Mernyei, Budapest, HU;
Matthijs D. Pardoen, Sunnyvale, CA (US);
János Erdélyi, Dunakeszi, HU;
Attila Zólomy, Budapest, HU;
Ferenc Mernyei, Budapest, HU;
Integration Associates Inc., Mountain View, CA (US);
Abstract
Disclosed is a circuit and method for continuous automatic tuning of a resonant circuit. A resonance voltage of the resonant circuit is phase shifted by a predetermined phase shift Φ degrees and an input voltage signal to a power amplifier driving the resonant circuit is phase shifted by Φ±90 degrees to place the signals in quadrature. The phase shifted signals are mixed to obtain a error signal. The error signal is compared to a predetermined voltage range in order to generate control signals for a control word generator, such as an up-down counter. The control word generator produces a control word that drives a capacitance bank that is part of the resonant circuit. The present invention continuously automatically adjusts the capacitance of the capacitance bank to tune the resonant circuit.