A Bulk Acoustic Wave (BAW) Based Transceiver for an In-Tire-Pressure Monitoring Sensor Node

作者：Flatscher Martin^*; Dielacher Markus; Herndl Thomas; Lentsch Thomas; Matischek Rainer; Prainsack Josef; Pribyl Wolfgang; Theuss Horst; Weber Werner

来源：IEEE Journal of Solid-State Circuits, 2010, 45(1): 167-177.

DOI：10.1109/JSSC.2009.2034436

• bulk acoustic wave (BAW)
• resonator
• transceiver
• chip stack
• oscillator
• low noise amplifier (LNA)
• matching network
• power amplifier

Attaching a tire pressure monitoring system (TPMS) on the inner liner of a tire allows sensing of important additional technical parameters, such as vehicle load or tire wearout. The maximum weight of the sensor is limited to 5 grams including package, power supply, and antenna. Robustness is required against extreme levels of acceleration. The node size is limited to about 1 cm to avoid high force-gradients due to device-deformation and finally, a long power supply lifetime must be achieved.
In this paper a low-power FSK transceiver is presented. Exploiting BAW resonators the use of a bulky and shock-sensitive crystal and a PLL can be avoided. This makes the system more robust and radically reduces the start-up time to 2 mu s from few ms as in state-of-the-art crystal oscillator based systems. The current consumption of the transceiver is 6 mA in transmit mode with a transmit output power of 1 dBm and 8 mA in receive mode with a sensitivity of -90 dBm at a data rate of 50 kBit/s and a bit error rate of 10(-2). The transceiver ASIC and a microcontroller ASIC, a MEMS sensor, and a BAW die are arranged in a 3-D chip stack for best compactness, lowest volume, and highest robustness. The sensor node allows sensing of pressure, acceleration, supply voltage and temperature.

• 出版日期2010-1