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EDN, May 26, 2011

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LANE-CHANGE ASSISTANCE BLIND-SPOT DETECTION SELF-PARKING SI DE IMPACT SIDE IMP PARKING ASSISTANCE/ VISION E/ SIDE IMPACT LANE-CHANGE ASSISTANCE BLIND-SPOT DETECTION SIDE IMPACT SELF-PARKING CROSS- TRAFFIC ALERT LANE-DEPARTURE WARNING BRAKE- A PARKING ASSISTANCE ASSISTANCE/ COLLISION AVOIDANCE ADAPTIVE CRUISE CONTROL LANE-DEPARTURE WARNING CROSS- TRAFFIC ALERT RADAR APPLICATION ULTRASONIC Figure 2 Several driver-assistance systems are currently using radar technology to provide blind-spot detection, parking assistance, collision avoidance, and other driver aids (courtesy Analog Devices). sonic sensors in future designs (Figure 2). Radar works in any type of weather and has short-, medium-, and long- range characteristics. For example, adaptive cruise control works in the long range, looking 200m in front of the car, tracking the car, and accelerat- ing or braking the car to maintain a certain distance. Radar also provides blind-spot detection and lane-departure warning. Early versions of these systems audibly warned the driver of an impend- ing problem, but some implementations now take control of the car to avoid the problem. For example, the 2011 Infiniti M56 has an optional blind-spot-warn- ing/intervention system that relies on radar scans from the left and the right rear quadrant of a car. If the radar system detects a car in the driver's blind spot, a light comes on. If the driver activates the turn signal, an audible beep comes on. If the driver persists and starts to move into another lane, the car gently applies brakes on the opposite side of the car, moving the car back into the center of the lane (Reference 3). Most automotive radar systems cur- rently are not highly integrated, tak- ing up significant space, and are costly. Analog Devices' recently introduced AD8283 integrated automotive-radar- RV-3029-C2 REAL TIME CLOCK MODULE WORLD SMALLEST CERAMIC PACKAGE DIGITAL TEMPERATURE COMPENSATED RTC Accuracy: +/-3ppm @ 25C, Size: 5.0 x 3.2 x 1.2mm Voltage Range: 1.3 to 5.5V, SPI & I2 C Interface MICRO CRYSTAL SWITZERLAND sales@microcrystal.com www.microcrystal.com receiver analog front end represents the increasing integration that decreases the size and cost of automotive radar (Figure 3). It will sell for about 50% less than a discrete design for an automotive analog front end and fits into a 10×10- mm package. "The market is moving toward putting radar into nonluxury vehicles—cars for the rest of us," says Sam Weinstein, product manager for the Precision Linear Group at Analog Devices. The sample price for a six- channel AD8283 is $12.44 (1000). IR (infrared) LEDs and photosen- sors find use in automotive applications, such as rain sensing/wiper activation on SWISS MADE QUALITY 42 EDN | MAY 26, 2011

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