CIRCUIT CONFIGURATION FOR PROVIDING A COMPLEX VALUE LOCAL OSCILLATOR SIGNAL AND RECEIVER

摘要

The invention relates to a circuit configuration for providing a complex value local oscillator signal. Said configuration comprises two dual mixers (M1, M1', M2, M2') that are controlled on their input pairs by a signal processing circuit (1) by means of a reference signal supplied to an input (E, E') in such a manner that on the dual mixers adapted for frequency conversion, on the output side (A, A') thereof, an inphase and a quadrature component are provided and have an exact phase shift of 90 DEG relative each other and jointly form a complex value local oscillator signal. The circuit configuration is preferably used in a receiver for controlling a downlink frequency converter (12). The aforementioned principle allows reduction of the dependence of the frequency shift of 90 DEG on work tolerances, a reduced frequency dependence of the phase shift and a substantially reduced current consumption of a mobile radio receiver.