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:
Feb. 28, 2006
Filed:
Dec. 02, 2003
Malcolm H. Smith, Phoenix, AZ (US);
Malcolm H. Smith, Phoenix, AZ (US);
Intel Corporation, Santa Clara, CA (US);
Abstract
A loop filter for a frequency synthesizer provides a lower frequency pole with a smaller capacitor than conventional filters. The loop-filter comprises a resistor and a smaller capacitor in a series-feedback path, and a transconductor to sense a voltage across the resistor to either source or sink additional current proportional to the sensed voltage. The transconductor and the smaller capacitor may provide a larger capacitance. The loop filter also may comprise an operational amplifier having the smaller capacitor and the resistor in the series-feedback path to receive pulses from a charge pump. The filter may integrate the pulses and may generate a control voltage related to a width of the pulses.