two different mixing elements the converter 20 has a time multiplexed mixing element mix 2 referred to here for sake of convenience as a multiplexed mixing element mix 2 the multiplexed mixing element mix 2 has an input port for a filtered incoming signal x u2032 an input port for a lo signal z and an output for providing a signal mixed with the lo signal a control signal source 22 provides a control signal y having a frequency f y the control signal y is used to control a first switch and a second switch sw 2 a and sw 2 b the switches sw 2 a and sw 2 b control respectively the phase of the lo signal fed to the multiplexed mixing element mix 2 and the path which is used from the output of the multiplexed mixing element mix 2 to a respective node of the combiner 12 the second switch sw 2 b makes a connection between the input port of the multiplexed mixing element mix 2 and alternately either the in phase lo signal output 11 a or the anti phase lo signal output 11 b of a phase shifter unit 11 the first switch sw 2 a makes a connection between the output of the multiplexed mixing element mix 2 and alternately either to the first in phase node 12 a or to the second anti phase node 12 b of the combiner 12 at a first moment in time the second switch sw 2 b couples the in phase local oscillator output.