Pulse or digital communications – Transmitters
Reexamination Certificate
2010-04-05
2011-10-11
Phu, Phuong (Department: 2611)
Pulse or digital communications
Transmitters
C375S298000, C375S259000, C375S256000, C455S076000, C455S091000
Reexamination Certificate
active
08036304
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 the necessary information to reconstruct the I and Q baseband signals. The differential sampling is performed according to a first and second control signals that are phase shifted with respect to each other. In embodiments of the invention, the control signals 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.
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paten
Bultman Michael J.
Cook Robert W.
Looke Richard C.
Moses, Jr. Charley D.
Rawlins Gregory S.
Parkervision, Inc.
Phu Phuong
Sterne Kessler Goldstein & Fox P.L.L.C.
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