Patent ID: 7536165
Filing Date: 2009-05-19
Classification: H03B,H03D,H03K

Abstract:
1. A direct conversion receiver comprising: a mixer that is configured to receive a differential radio-frequency signal and a differential local oscillator signal to produce therefrom a differential output signal, a differential bias error detector, operably coupled to the mixer, that is configured to receive the differential output signal from the mixer and to produce therefrom a measure of imbalance of a phase of the differential output signal, and a bias error corrective network, operably coupled to the bias error detector and the mixer that is configured to apply a differential corrective signal to the mixer to reduce the measure of imbalance of the phase of the differential output signal, the differential corrective signal comprising a first correction signal and a second correction signal applied to the mixer in opposition to the local oscillator to transform residual leakage in the local oscillator to common-mode leakage.