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This paper presents a differential current re-use stacked double common-emitter stage low-noise amplifier and corresponding receiver frontend for 77 GHz automotive radar systems. Both circuits have been manufactured in an improved SiGe:C HBT technology with ft/fmax = 200/250 GHz and can operate in differential or single-ended mode. The receiver shows a gain of 24.5 dB and single sideband noise figure of 15.8 dB. The gain and noise figure of the LNA in single-ended mode are 12 dB and 9.5 dB respectively, suggesting a differential noise figure of approximately 6.5 dB.