A wireless sensor reader is provided to interface with a wireless sensor. The wireless sensor reader transmits an excitation pulse to cause the wireless sensor to generate a ring signal. The wireless sensor reader receives and amplifies the ring signal and sends the signal to a phase-locked loop. A voltage-controlled oscillator in the phase-locked loop locks onto the ring signal frequency and generates a count signal at a frequency related to the ring signal frequency. The voltage-controlled oscillator is placed into a hold mode where the control voltage is maintained constant to allow the count signal frequency to be determined.
申请公布号
US8154389(B2)
申请公布日期
2012.04.10
申请号
US20090419326
申请日期
2009.04.07
申请人
ROWLAND HARRY D.;WATKINS ROGER DWIGHT;SUNDARAM BALAMURUGAN;ENDOTRONIX, INC.
发明人
ROWLAND HARRY D.;WATKINS ROGER DWIGHT;SUNDARAM BALAMURUGAN