Receiver capable of reducing local oscillation leakage and in-phase/quadrature-phase (I/Q) mismatch and an adjusting method thereof

摘要

A receiver having a mixer for mixing a radio frequency signal and a local oscillator signal so as to generate a base band signal, a detecting unit for generating from the base band signal a detection signal that represents an extent of local oscillation leakage, and an adjusting unit coupled electrically to said mixer for outputting a control signal thereto to control a current operating state of said mixer, said adjusting unit being further coupled electrically to said detecting unit, and determining whether there is a reduction in the extent of local oscillation leakage based on the detection signal from said detecting unit. In operation, the adjusting unit maintains an adjusting direction for the control signal upon determining that the extent of local oscillation leakage is reduced, reverses the adjusting direction upon determining that the extent of local oscillation leakage is not reduced, and adjusts the control signal according to the adjusting direction.

主权项

1. A receiver comprising:
a mixer for mixing a radio frequency signal and a local oscillator signal so as to generate a base band signal; a detecting unit for receiving the base band signal and generating from the base band signal a present detection signal that represents a present extent of local oscillation leakage; and an adjusting unit coupled electrically to said mixer for outputting a control signal thereto to control an operating state of said mixer, said adjusting unit being further coupled electrically to said detecting unit to receive the present detection signal, said adjusting unit determining whether there is a reduction in the current extent of local oscillation leakage, which is determined when the current extent of local oscillation leakage is smaller than a previous extent of local oscillation leakage, based on the detection signal from the detecting unit; wherein said adjusting unit maintains an adjusting direction for the control signal upon determining that the present extent of local oscillation leakage is reduced, reverses the adjusting direction upon determining that the present extent of local oscillation leakage is not reduced, and adjusts the control signal according to the adjusting direction.