Patent ID: 8891974
Filing Date: 2014-11-18
Classification: H04B

Abstract:
1. A distortion compensation circuit for compensation of distortion produced by at least one non-linear element, said distortion compensation circuit comprising: a primary signal path configured to carry at least a portion of the magnitude of an input signal; a secondary signal path coupled to said primary signal path, said secondary signal path configured to receive at least a portion of said input signal, to generate distortion, and to add at least a portion of said generated distortion back into said primary signal path; a tunable filter located in said secondary signal path, said tunable filter configured to control the phase of said generated distortion in response to a phase adjustment control signal, wherein said tunable filter comprises: a varactor having adjustable capacitance to control the phase of said generated distortion in response to said phase adjustment control signal; and capacitors coupled in series with said varactor, said capacitors configured to block said phase adjustment control signal from extending beyond said tunable filter; and a signal controlled phase inverter located in said secondary signal path, said signal controlled phase inverter being configured to invert said phase of said signal on said secondary path in response to a phase inversion control signal.