Patent ID: 6127889
Filing Date: 2000-10-03
Classification: H03F

Abstract:
A method of reducing distortion in an amplified signal, said method comprising the steps of:splitting a signal onto a main signal path and a feed forward path;amplifying said signal from said main signal path to produce said amplified signal with distortion on said main signal path;obtaining a portion of said amplified signal with said distortion;combining said portion of said amplified signal with said distortion with said signal from said feed forward path to provide said distortion on said feed forward path;splitting said distortion on said feed forward path onto a correction path and a nested feed forward path;amplifying said distortion on said correction path to produce amplified distortion with second distortion on said correction path;obtaining a portion of said amplified distortion with said second distortion;combining said portion of said amplified distortion with said second distortion with said distortion from said nested feed forward path to provide said second distortion on said nested feed forward path;splitting said second distortion onto a second correction path and a second nested feed forward path;amplifying said second distortion on said second correction path to produce said amplified second distortion with third distortion on said second correction path;obtaining a portion of said amplified second distortion with said third distortion;combining said portion of said amplified second distortion with said third distortion with said second distortion on said second nested feed forward path to provide said third distortion on said second nested feed forward path;feeding forward said third distortion to combine with said third distortion on said second correction path and reduce said third distortion on said second correction path;combining said amplified second distortion on said second correction path with said amplified second distortion on said correction path to reduce said second distortion on said correction path; andcombining said distortion with reduced second distortion from said correction path with said distortion on said main signal path.