Wireless Passive High-Temperature Sensor Readout System for Rotational-Speed Measurement

Figure 6

Prototype of the sensor demodulating circuit. The prototype includes two PCBs: the (a) one is RF stimulation PCB, and it provides an adjustable stimulation; the (b) one is envelope detection PCB, and it is used to demodulate the reflect signal of antenna and sensor. The stimulate frequency can be adjusted by the GPIO interface, and the output stimulate voltage is fed to the left subminiature version B (SMB) connector.

(a) The stimulation generator PCB

(b) The envelope detection PCB