
122 Semiconductor Device-Based Sensors for Gas, Chemical, and Biomedical Applications
© 2011 by Taylor & Francis Group, LLC
sensor nodes. This enables very long lifetime operation using batteries, thus making the system
truly wireless. Experimental results showed that a 150 m transmission distance can be achieved
with 10 mW total power consumption. The entire sensor package can be built for less than $50,
making it extremely competitive in today’s market [62,63,118].
3.6.1 sensor module
The sensor module was fully integrated on an FR4 PC board and packaged with a battery as shown
in Figure3.33 (left). The dimension of the sensor module package ...