A mixer circuitry (100, 200) comprises: a first mixer (110, 210) configured to mix a first local oscillator, LO, signal having an LO frequency with an intermediate frequency, IF, signal and generate an output signal; an LO leakage detector (120, 220) comprising: a coupler coupled to the output of the first mixer; a second mixer configured to mix a second oscillator signal with the output signal of the first mixer received from the coupler and generate an output signal, characterized in that: the second oscillator signal frequency is lower than the IF signal frequency; a third quadrature mixer configured to mix the output signal of the second mixer with an LO signal having a same frequency as the first LO signal, and generate quadrature output signals having a same frequency as the second oscillator signal frequency; an amplifier arrangement coupled to the third quadrature mixer for amplifying and filtering the quadrature output signals from the third quadrature mixer; a fourth mixer arrangement configured to mix the output signal from the amplifier arrangement with the second oscillator signal and generate a direct current, DC, signal; and an analog-to-digital converter arrangement for converting the DC signal from the fourth mixer arrangement to digital words representing detected LO leakage from the first mixer; the mixer circuitry further comprises: a digital processing unit (130, 230) configured to process the detected LO leakage and generate a control word; and a digital-to-analog converter, DAC, arrangement (140, 240) coupled to IF input of the first mixer, wherein the DAC arrangement is configured to receive the control word and adjust the IF input signal of the first mixer. a first mixer (110, 210) configured to mix a first local oscillator, LO, signal having an LO frequency with an intermediate frequency, IF, signal and generate an output signal; an LO leakage detector (120, 220) comprising: a coupler coupled to the output of the first mixer; a second mixer configured to mix a second oscillator signal with the output signal of the first mixer received from the coupler and generate an output signal, characterized in that: a coupler coupled to the output of the first mixer; a second mixer configured to mix a second oscillator signal with the output signal of the first mixer received from the coupler and generate an output signal, characterized in that: the second oscillator signal frequency is lower than the IF signal frequency; a third quadrature mixer configured to mix the output signal of the second mixer with an LO signal having a same frequency as the first LO signal, and generate quadrature output signals having a same frequency as the second oscillator signal frequency; an amplifier arrangement coupled to the third quadrature mixer for amplifying and filtering the quadrature output signals from the third quadrature mixer; a fourth mixer arrangement configured to mix the output signal from the amplifier arrangement with the second oscillator signal and generate a direct current, DC, signal; and an analog-to-digital converter arrangement for converting the DC signal from the fourth mixer arrangement to digital words representing detected LO leakage from the first mixer; a third quadrature mixer configured to mix the output signal of the second mixer with an LO signal having a same frequency as the first LO signal, and generate quadrature output signals having a same frequency as the second oscillator signal frequency; an amplifier arrangement coupled to the third quadrature mixer for amplifying and filtering the quadrature output signals from the third quadrature mixer; a fourth mixer arrangement configured to mix the output signal from the amplifier arrangement with the second oscillator signal and generate a direct current, DC, signal; and an analog-to-digital converter arrangement for converting the DC signal from the fourth mixer arrangement to digital words representing detected LO leakage from the first mixer; a digital processing unit (130, 230) configured to process the detected LO leakage and generate a control word; and a digital-to-analog converter, DAC, arrangement (140, 240) coupled to IF input of the first mixer, wherein the DAC arrangement is configured to receive the control word and adjust the IF input signal of the first mixer.