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:
Jul. 02, 2002
Filed:
Sep. 14, 2000
Paul E. Quesenberry, Marietta, GA (US);
Scientific-Atlanta, Inc., Lawrenceville, GA (US);
Abstract
Systems and methods for digitizing broadband signals using multiple analog-to-digital converters (ADCs) and a calibration system for adjusting the phase and bias of the sampled signal such that the output digitized, sample closely approximates the input broadband analog signal. A calibration signal is combined with the broadband signal and the combined signal is converted to digital. The combined signal splits into portions equal to the number of ADCs in the system. An off-line digital signal processor (DSP) analyzes samples representing a portion of the combined signal and computes any necessary adjustments to phase and amplitude of the digitized samples. If adjustments are required, a real-time DSP adjusts the phase and amplitude of the digitized sample, by use of a multiplier and/or adder included in the real-time DSP. The separate portions of the digitized sample are recombined by a multiplexer to create a single digitized output representing the broadband analog signal.