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:
Jan. 14, 2014
Filed:
Jan. 19, 2012
Yunfei Feng, San Diego, CA (US);
Sankaran Aniruddhan, Chennai, IN;
Rajagopalan Rangarajan, San Diego, CA (US);
Yunfei Feng, San Diego, CA (US);
Sankaran Aniruddhan, Chennai, IN;
Rajagopalan Rangarajan, San Diego, CA (US);
QUALCOMM Incorporated, San Diego, CA (US);
Abstract
A frequency synthesizer circuit is disclosed. The frequency synthesizer circuit includes a phase and frequency detector. The frequency synthesizer circuit also includes a first charge pump and a second charge pump, each coupled to the phase and frequency detector. The frequency synthesizer circuit also includes a loop filter that includes a resistor and at least two capacitors. The second charge pump is coupled between the resistor and a capacitor that creates a zero in a transfer function of the loop filter. The frequency synthesizer circuit also includes a voltage controlled oscillator that produces an output frequency based on an output of the loop filter.