Patent ID: 8446997
Filing Date: 2013-05-21
Classification: H03F,H04B

Abstract:
1. A third-order intermodulation compensator comprising: a detector responsive to an input signal to provide a second-order difference signal; a multiplier responsive to the second-order difference signal and the input signal to provide a third-order intermodulation signal and comprising a square-law device and a balanced microwave hybrid mixer; a signal compensator responsive to the third-order intermodulation signal to provide a compensating signal; a coupler that combines the compensating signal with the input signal to reduce any third-order intermodulation distortion in the input signal; and a sweep circuit that controls a frequency sweep of the input signal and further controls at least one control signal supplied to the signal compensator to vary phase and quadrature amplitude of the third-order intermodulation signal according to variation of the frequency of the input signal.