公开(公告)号：US20170309164A1

公开(公告)日：2017-10-26

申请号：US15638432

申请日：2017-06-30

Applicant: Endotronix, Inc.

Inventor： Harry Rowland ,  Roger Watkins ,  Balamurugan Sundaram

IPC: G08C17/02 ,  A61B5/00 ,  A61B5/0215

CPC classification number: G08C17/02 ,  A61B5/0031 ,  A61B5/0215 ,  A61B5/6882 ,  A61B5/7225 ,  A61B2562/0219

Abstract: 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.

公开(公告)号：US20130222153A1

公开(公告)日：2013-08-29

申请号：US13859444

申请日：2013-04-09

Applicant: Endotronix, Inc.

Inventor： Harry Rowland ,  Roger Watkins ,  Balamurugan Sundaram

IPC: G08C17/02

CPC classification number: G08C17/02 ,  A61B5/0031 ,  A61B5/0215 ,  A61B5/6882 ,  A61B5/7225 ,  A61B2562/0219

Abstract: 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.