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. 12, 2011
Filed:
Apr. 13, 2007
Franz-otto Witte, Teningen, DE;
Franz-Otto Witte, Teningen, DE;
Trident Microsystems (Far East) Ltd., Grand Cayman, KY;
Abstract
The invention relates to a method and a circuit for carrier control in a quadrature demodulator, wherein a complex-value input signal (I, Q) is supplied to a mixer () to perform mixing with a mixing frequency (fm) to create a mixed signal (Ir, Qr), the mixed signal (Ir, Qr) is supplied to a processing section (s) to generate a processed signal (Ie, Qe), the processed signal (Ie, Qe) is supplied to phase measurement device () in order to measure a phase (φm) of the processed signal (Ie, Qe) and the measured phase (φm) is supplied to a phase controller () in order to control the mixing frequency (fm); wherein an idle time (z) is created at least during the processing in the processing section (). To enable a fast switching-on transition, the mixing frequency (fm) is summed or integrated to create a mixing phase (φc), the mixing phase (φc) is used for the mixing operation, as well as fed back to the phase control (), and an error created by the feedback is compensated for with a time-delayed second feedback of the mixing phase (φc).