A 24 GHz wideband monostatic FMCW radar system based on a single-channel SiGe bipolar transceiver chip
In this paper a monostatic frequency-modulated continuous-wave (FMCW) radar system around a center frequency of 24 GHz with a wide tuning range of 8 GHz (33%) is presented. It is based on a fully integrated single-channel SiGe transceiver chip. The chip architecture consists of a fundamental VCO, a receive mixer, a divider chain, and coupling/matching networks. All circuits, except for the divider, are designed with the extensive use of on-chip monolithic integrated spiral inductors. The chip is fabricated in a SiGe bipolar production technology which offers an fT of 170 GHz and fmax of 250 GHz. The phase noise at 1 MHz offset is better than -100 dBc/Hz over the full-tuning range of 8 GHz and a phase noise of better than -111 dBc/Hz is achieved at 27 GHz. The peak output power of the chip is -1 dBm while the receive mixer offers a 1 dBm input referred compression point to keep it from being saturated. The chip has a power consumption of 245 mW and uses an area of 1.51 m m2. The FMCW radar system achieves a power consumption below 1.6 W. Owing to the high stability of the sensor, high accuracy mesaurements with a range error <±250 Âm were achieved. The standard deviation between repeated measurements of the same target is 0.6 Âm and the spatial resolution is 28 mm.