Importance

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Abstract

A DC offset compensation circuit for use with a detector of an interference cancellation system or the like includes an RF switch. The interference cancellation system has a reference signal path on which a reference signal representative of an interfering signal is provided to the detector, and an error signal path on which an error signal representative of a received signal of a radio receiver system to which the interference cancellation system is connected is provided to the detector. The RF switch is positioned in the error signal path of the interference cancellation system and is switchable between an open position in which the detector is disconnected from the error signal path, and a closed position in which the detector is connected to the error signal path. A switch controller is coupled to the RF switch, and controls the positioning of the RF switch in the open and closed positions. The detector provides a first DC signal when the RF switch is in the open position. The first DC signal is representative of the DC offset voltage the detector and associated circuitry generate. The detector further provides a second DC signal when the RF switch is in the closed position. The second DC signal is representative of the DC offset voltage the detector generates and a DC voltage attributable to an error signal provided to the detector. The first and second DC signals are measured, and the difference in magnitude between the two signals is calculated to produce the compensated result.

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First Claim