Patent ID: 7945221
Filing Date: 2011-05-17
Classification: H04B

Abstract:
1. Transmitter device for wireless communication equipment, said device comprising at least one path with a gain range, the path comprising: a low-pass filter for filtering first and second differential signals and applying a chosen first attenuation to each of them to decrease the amplitudes thereof; a differential transconductor arranged for applying a chosen second attenuation to each differential signal coming from said low-pass filter to decrease its continuous component; and a mixer for mixing separately the first and second signals delivered by the transconductor with local oscillator carriers at a chosen radio frequency to deliver first or second output RF signals to be transmitted, characterized in that said transconductor comprises first and second original cells for defining a first and a second original signal respectively from said first and second differential signals having the first attenuation, and N first and N second signal copy cells each arranged for generating a copy of the first or second original signal, the number of signal copy cells used defining said second attenuation, and said first and second attenuations to be applied being chosen so that the value, defined by the offset between the continuous component of the first and second signals delivered by said transconductor divided by the amplitude of the first or second signal delivered by said transconductor, stays below a chosen maximum value over the whole gain range of the path.