Toshiyuki Nagasaku

A 28GHz Low-Phase-Noise CMOS VCO Using an Amplitude-Redistribution Technique

Increasing demands for multi-Gb/s data transmission make the mm-wave wireless communication systems more attractive. The VCO is an essential block in these systems. This paper describes an amplitude-redistribution technique which improves phase noise performance of mm-wave cross-coupled VCOs by controlling the distribution of voltage swings on the oscillator nodes. A 28GHz VCO, fabricated in a 0.13mum CMOS process, uses this technique and demonstrates low phase-noise performance of -112.9dBc/Hz at 1MHz offset.

77GHz Low-Cost Single-Chip Radar Sensor for Automotive Ground Speed Detection

A new 77 GHz single-chip radar sensor has been developed, which encapsulates a GaAs p-HEMT transceiver MMIC with an on-chip patch antenna in a resin-molded package integrated with a resin collimating lens on the top to achieve an EIRP of 13.5 dBm and a receiving gain of 8 dB. The packaged sensor, measuring 6.5times4.4times6.0 mm3 with only DC and baseband- frequency leads, offers ease of handling with an extreme low-cost potential for a variety of applications. When adopted to an automotive ground speedometer integrated with an signal processing unit, the sensor demonstrated accurate and reliable detections of vehicle speed with a standard deviation of 1.5% under normal driving conditions.

24GHz Intruder Detection Radar with Beam-switched Area Coverage

A 24 GHz intruder detection radar with three vertically-switched-beam antennas has been developed to cover a fan-shaped ground area with 90 degs. in azimuth and 0 to over 14 m in range, when mounted at a height of 5 m. Each switched beam monitors a different range segment with a monopulse scheme employed to achieve the wide azimuth coverage. An experimental radar with a Tx/Rx module fully assembled with MMICs successfully detected a human intruder with a position accuracy of 50 cm when moving at 1.4 m/s.

Single-Chip 77GHz Radar Sensor and its Automotive Applications

This paper describes the development of a compact and low cost millimeter wave Doppler radar sensor (77GHz band), which can measure the vehicle ground speed precisely. The sensor has three unique features: First, all the radio frequency components are integrated into a single chip, including a millimeter wave transceiver and an on-chip antenna. Then, the chip package is made of plastic resin without use of expensive ceramic. Finally, a tiny dome-shaped resin lens is attached to the chip to collimate waves. These technologies enable the sensor to measure 53 × 71 × 65 mm3, to weight 115 grams. Compared to a conventional optical measuring instrument for example, the sensor weights only about fifteenth and is onefifth of the size, while the measurement accuracy is almost comparable. So this sensor seems to have a variety of potential applications. In this paper, we also considered the feasibility of some other applications than just measuring ground speed. One is the yaw rate detection by using two sensors mounted on both sides of the vehicle. It can be calculated from differential speed between sensors. From the experimental results, we found that the detection was possible and the limit of sensitivity depended on the speed measurement accuracy which is under 2% variation. The other possible application is detecting obstruction. Although it was difficult to cover from 0 meters to far side with one sensor because of its narrow beam shape, we confirmed from experiments that the sensor was able to detect vehicles in the next lane in the range from at least 10 to 60 meters. Language: en