I/Q Demodulator based on six-port circuit topologies for mobile receivers

摘要

The underlying invention generally relates to the field of mobile receivers (602) with N-port circuit topologies, especially to a six-port junction device (102') with four power detectors (104a-d) that can advantageously be used for the processing and direct down-conversion of broadband (modulated) RF band-pass signals within an operation bandwidth between 1 and 7 GHz, a mobile receiver (602) comprising such a six-port junction device (102'), and particularly to a method for calibrating said mobile receiver (602).;According to one embodiment of the underlying invention, the mobile receiver (602) works in the range where the detector characteristic is non-linear. It allows to increase the dynamic range of said mobile receiver (602), which has a positive effect on direct down-conversion, large-signal issues, and automatic gain control (AGC), and may be used for a plurality of mobile receiver topologies. Preferably, specially designed power detectors (104a-d) are applied as means for I/Q demodulation. The inventive approach is preferably realized by an analog circuitry (300/400) which is connected to the six-port junction device (102') on the same chip.