Patent ID: 6340914
Filing Date: 2002-01-22
Classification: H03F

Abstract:
A circuit for processing an information signal feeding an amplifier, in which is embedded a pilot signal, the amplifier having an input and an output, the circuit comprising:a feedforward configuration for applying distortion correction to the output of the amplifier, said configuration comprising: a first signal path being tapped at the input of the amplifier and connected to the output of the amplifier to apply said distortion correction; and a second signal path being tapped at a point between the output of the amplifier and the point at which the output of said first signal path is coupled to the output of the amplifier, said second signal path being coupled to the first signal path; a first demodulator, for demodulating the embedded pilot signal at a first point before distortion correction is applied by said configuration, to provide a first demodulated pilot signal; a second demodulator, for demodulating the embedded pilot signal at a second point after distortion correction is applied by said configuration, to provide a second demodulated pilot signal; and a controller connected to the first and second demodulators and connectable to said configuration, for varying the distortion correction applied by said configuration as a function of at least one parameter of the first and second demodulated pilot signals.