Radiofrequency transmitter with a high degree of integration and possibly with self-calibrating image deletion

USRE42043E1 · kind E1 · reissue

Inventor

• Eric Andre · Fontaine, FR

Key dates

• Filing date: Dec 23, 2005
• Grant date: Jan 18, 2011
• Expiry date: Dec 23, 2025

Classification

• Technology area (CPC —): General

Abstract

A radio frequency transmitter, of the type supplied with two signals in baseband and in quadrature, I(nT) and q(nT), which are images from two binary streams representing information to be transmitted, 1) provides a first transposition into the digital domain, at an intermediate frequency ω0, for the baseband signals and generates, by combination, two signals of intermediate frequency in quadrature, 2) provides a second transposition into the analog domain, after multiplication by a frequency ω1, followed by a summation of the two signals at intermediate frequency and in quadrature, in such a way that a resultant signal is generated which is found finally around a frequency ω2, where ω2=ω0+ω1. In an advantageous variant, the radio frequency transmitter additionally digitally compensates gain and phase imperfections of the direct conversion.