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:
Apr. 01, 2014
Filed:
Dec. 18, 2012
Phuong Thu-minh Huynh, Fairfax, VA (US);
Phuong Thu-Minh Huynh, Fairfax, VA (US);
Other;
Abstract
A calibration technique to compensate for the phase error between the in-phase and quadrature sampling clocks controlling the quadrature bandpass sampling delta-sigma analog-to-digital demodulator (QBS-ADD) is provided. A low-frequency test tone is injected, up-converted to the RF frequency, and added to an input of the QBS-ADD. The test tone is demodulated by the QBS-ADD into an in-phase signal and a quadrature signal. The in-phase and quadrature signals are filtered and multiplied together to generate a phase error signal, which is subsequently integrated to generate a phase shift control signal being used to correct the phase error between the in-phase and quadrature sampling clocks.