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:
Nov. 26, 2013
Filed:
Sep. 13, 2011
David F. Sorrells, Middleburg, FL (US);
Michael J. Bultman, Jacksonville, FL (US);
Robert W. Cook, Switzerland, FL (US);
Richard C. Looke, Jacksonville, FL (US);
Charley D. Moses, Jr., DeBary, FL (US);
Gregory S. Rawlins, Heathrow, FL (US);
Michael W. Rawlins, Lake Mary, FL (US);
David F. Sorrells, Middleburg, FL (US);
Michael J. Bultman, Jacksonville, FL (US);
Robert W. Cook, Switzerland, FL (US);
Richard C. Looke, Jacksonville, FL (US);
Charley D. Moses, Jr., DeBary, FL (US);
Gregory S. Rawlins, Heathrow, FL (US);
Michael W. Rawlins, Lake Mary, FL (US);
ParkerVision, Inc., Jacksonville, FL (US);
Abstract
A balanced transmitter up-converts I and Q baseband signals directly from baseband-to-RF. The up-conversion process is sufficiently linear that no IF processing is required, even in communications applications that have stringent requirements on spectral growth. In operation, the balanced modulator sub-harmonically samples the I and Q baseband signals in a balanced and differential manner, resulting in harmonically rich signal. The harmonically rich signal contains multiple harmonic images that repeat at multiples of the sampling frequency, where each harmonic contains necessary information to reconstruct the I and Q baseband signals. The differential sampling is performed according to control signals that are phase shifted with respect to each other. The control signals may have pulse widths (or apertures) that operate to improve energy transfer to a desired harmonic in the harmonically rich signal. A bandpass filter can then be utilized to select the desired harmonic of interest from the harmonically rich signal.