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In this paper we present a 24 GHz-MMIC (Monolithic Microwave Integrated Circuit) using SiGe HBTs (Hetero Bipolar Transistor) which includes a differential oscillator realized with lumped elements and integrated mixer. The oscillator uses a differential circuit topology. The measured output power into a 1000 differential load is about 2 dBm and the phase-noise is -104 dBc/Hz at 1 MHz offset frequency. The differential output of the oscillator is used for driving a single balanced mixer. The conversion gain Is around -4 dB, depending on the IF frequency. The area consumption of mixer and oscillator Including all pads is 465 /spl mu/m /spl times/ 475 /spl mu/m.