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:
Dec. 27, 2011
Filed:
Nov. 03, 2004
Yan Cui, Gurnee, IL (US);
Yan Cui, Gurnee, IL (US);
Freescale Semiconductor, Inc., Austin, TX (US);
Abstract
A transmitter includes a modulating and combining circuit to which signals are supplied and modulated into in-phase and quadrature-phase signals. The in-phase and quadrature-phase signals are combined in a closed-loop voltage summing circuit. The voltage summing circuit is an amplifier using capacitors as negative feedback elements. The negative feedback improves the linearity of the modulator. An LC tank circuit at the output of the voltage summing circuit bandpass filters the output before being applied to a power amplifier and eventually transmitted by an antenna. A multi-summing amplifier with different frequency tuning can be used for a multi-band transmitter design.