Patent ID: 6452447
Filing Date: 2002-09-17
Classification: H03F

Abstract:
An adaptive distortion-compensation apparatus comprising:first envelope detection means for obtaining a first envelope detection signal of an input signal; first storage means, supplied with an address signal based on the first envelope detection signal, for outputting an amplitude compensation data signal corresponding to the address signal; second storage means, supplied with the address signal based on the first envelope detection signal, for outputting an output data signal corresponding to the address signal, and for writing write-in data; latch means for latching the output data signal read out from the second storage means; a power amplifier; second envelope detection means, supplied with an output signal of the power amplifier, for obtaining a second envelope detection signal; sign detection and logical conversion means for outputting positive and negative digital signals in accordance with a positivity or a negativity of a difference between the first envelope detection signal and the second envelope detection signal; first addition means for adding an output signal of the latch means and the output signal of the sign detection and logical conversion means and for supplying the added signals to the second storage means as the write-in data; second addition means for adding the output signal of the first storage means and the output signal of the latch means and for obtaining a second addition output signal; a digital to analog conversion means for converting the output signal of the second addition means into an analog signal and for supplying the analog signal to the power amplifier; and gain control means, supplied with the input signal, for controlling a gain of the input signal in accordance with the output of the digital to analog conversion means and for supplying the gain-controlled input signal to an amplification circuit.