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. 28, 2002
Filed:
Jun. 30, 2000
Hans-Eberhard Kröbel, München, DE;
Richard Stepp, München, DE;
Infineon Technologies AG, Munich, DE;
Abstract
A PLL synthesizer circuit is disclosed having a programmable divider circuit driven by a controller (microprocessor) for selecting a desired output frequency (f ) of the PLL synthesizer circuit. An operating mode selector circuit optionally drives a receive operating mode and at least one further operating mode (frequency change operating mode) of the PLL synthesizer circuit. The PLL synthesizer circuit has a smaller settling time constant in the frequency change operating mode. The change into the frequency change operating mode is initiated by a detection of the drive of the programmable divider by means of a changed (new) drive value. The change from the frequency change operating mode into the receive operating mode is caused whenever the phase difference, that is to say the output signal of the phase detector falls below a predetermined threshold value.