Patent ID: 7420416

Claim:
An analog predistorter comprising: a coupler having an input port, an output port, a first and a second coupled port separated by 90 degrees; a first compensation circuit connected to said first coupled port and comprising: a first combination of at least one linear circuit element and a first pair of parallel diodes connected in head-to-head configuration; and a first impedance adjusting unit for adjusting an impedance seen by said first pair of parallel diodes of said first circuit element combination; a first bias control circuit for controlling a bias level in said first circuit element combination; a second compensation circuit connected to said second coupled port and comprising: a second combination of linear circuit elements and a second pair of parallel diodes connected in head-to-head configuration nonlinear; and a second impedance adjusting unit for adjusting an impedance seen by said second pair of parallel diodes of said second circuit element combination; and a second bias control circuit for controlling a bias level in said second circuit element combination.