Patent ID: 6728527
Filing Date: 2004-04-27
Classification: H03C

Abstract:
A double up-conversion modulator, including a first up-conversion stage, formed of a first modulation unit,receiving respectively at first, second, third and fourth inputs quadriphased baseband signals formed by a first in-phase signal, a second in-phase opposition signal, a third in quadrature signal and a fourth in quadrature opposition signal, controlled by four quadriphased carrier signals at a first intermediate frequency formed by a first in-phase carrier signal, a second in-phase opposition carrier signal, a third in quadrature carrier signal and a fourth in quadrature opposition carrier signal, and delivering at one output a first up-converted signal at said first intermediate frequency, characterised in that said first stage is further formed of a second modulation unit similar to said first unit;receiving respectively at first, second, third and fourth inputs said first, second, third and fourth baseband signals, controlled by said first, second, third and fourth carrier signals at said first intermediate frequency, and delivering at one output a second up-converted signal, in phase opposition with respect to said first up-converted signal, at said first intermediate frequency, and in that the modulator further includes a second up-conversion stage, receiving respectively at a first and a second inputs said first and second up-converted signals, at said first intermediate frequency, controlled by two other carrier signals at a second intermediate frequency, formed by a fifth in-phase carrier signal and a sixth in phase opposition carrier signal, and delivering at one output a high frequency signal, said high frequency corresponding to the sum of said first and second intermediate frequencies.