An Integrated SiGe-BiCMOS Low Noise Transmitter Chip with a Frequency Divider Chain for 77 GHz Applications

This paper presents a low noise transmitter chip for a 77 GHz FMCW radar system being comprised of push-pull voltage controlled oscillator with an output buffer, a frequency divider chain and a peak-to-peak detector. The measurements show an output power of approximately 11 dBm at each of the two differential 50 Omega loads over a wide tuning range. The measured phase noise is about -85 dBc/Hz at 100 KHz offset frequency. The circuit has been implemented in a Freescale Semiconductor 0.18 mum SiGe-BiCMOS technology. SiGe-HBTs with a typical ft/fmax of 200GHz/205GHz are used as active devices