Patent ID: 6172562
Filing Date: 2001-01-09
Classification: H03F

Abstract:
A predistortion linearizer having a linear transmission channel and a non-linear transmission channel connected in parallel at an input to an input coupler and at an output to an output coupler,said linearizer including at least one digital control device connected in series in one transmission channel,said digital control device controlling the amplitude and phase of a radio frequency signal, and comprising:a variable digital attenuator;a variable digital phase-shifter;distributor means having one input and two outputs for dividing said radio frequency signal into a first signal part and a second signal part;a digital amplitude control first channel connected to an output of said distributor means and including said variable digital attenuator for controlling the amplitude of said first signal part;a digital phase control second channel connected to another output of said distributor means in parallel with said first digital control channel and including said variable digital phase-shifter for controlling the phase of said second signal part; andrecombiner means having one output and two inputs respectively connected to outputs of said two digital control channels for recombining the controlled two signal parts.