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. 10, 2008
Filed:
Sep. 07, 2005
Branislav Petrovic, La Jolla, CA (US);
Maxim Ashkenasi, La Jolla, CA (US);
Branislav Petrovic, La Jolla, CA (US);
Maxim Ashkenasi, La Jolla, CA (US);
Broadband Innovations, Inc., San Diego, CA (US);
Abstract
The present invention discloses a new type of extremely low-noise phase-frequency detector (PFD), broadband from DC to multi-GHz RF frequencies for PLL synthesizer applications. Free of any feedback mechanisms, thus inherently fast, it operates close to transition frequency fof IC processes or frequency limits of discrete mixers. The PFDutilizes complex SSB conversion in both the in-phase and quadrature arms, delaying the in-phase arm in, beating the delayed signalwith the un-delayed quadrature signalin mixer. The outputcontains both the frequency difference and the phase difference information between the two signalsand, providing both the frequency-discrimination (FD) and the phase detection (PD) functions. Utilizing standard mixers the PFDcan achieve superior CNRs of 180 dBc/Hz at multi-GHz RF. Additionally, utilizing the FD/FM demodulation capability, the present invention improves phase noise of various signals and linearity of FM modulators.