Patent ID: 6388518
Filing Date: 2002-05-14
Classification: H03F

Abstract:
A distortion compensation apparatus for compensating for distortion occurring in an amplifier, said distortion compensation apparatus comprising:distortion generating means for generating distortion of either amplitude or phase of a signal provided for the amplifier, signal level detecting means for detecting a level of the signal provided for the amplifier, distortion amount control means for controlling an amount of distortion generated by said distortion generating means based on the level detected by said signal level detecting means, and control timing adjusting means for adjusting a timing for controlling the amount of distortion by said distortion amount control means so that the distortion generated in the amplifier may be compensated, wherein said distortion generating means comprises a circuit for changing the amount of distortion generated depending on an analog control signal, said distortion amount control means comprises D/A converting means for converting a digital control signal into the analog control signal, and issuing the analog control signal at a timing depending on a timing signal, and the amount of distortion generated by said distortion generating means is controlled by sending the digital control signal to said distortion generating means through said D/A converting means, and said control timing adjusting means comprises clock signal generating means for generating a clock signal of a predetermined period, and timing signal generating means for generating the timing signal adjusted from a timing of the clock signal generated by said clock signal generating means, and the timing for controlling the amount of distortion by said distortion amount control means is adjusted by sending the timing signal generated by said timing signal generating means to said D/A converting means.