Patent ID: 7925170

Claim:
A predistortion circuit for a non-linear amplifier, the predistortion circuit comprising: a primary signal path configured to receive at least a portion of an input signal; a secondary signal path coupled to the primary signal path and configured to receive at least a portion of the input signal, the secondary signal path comprising a distortion generator configured to produce predistortion from the input signal on the secondary path, the distortion generator comprising at least first and second diodes and adjustable impedance matching elements in the secondary signal path and configured to adjust impedance matching in the distortion generator; and an adjustable bias control coupled to the first and second diodes, the adjustable bias control being configured to adjust a bias current provided to the diodes to control at least one of phase and magnitude of the predistortion such that the predistortion is capable of compensating for distortion generated by the non-linear amplifier at a highest frequency component of interest for the non-linear amplifier.