Wireless sensor reader
US9894425B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 7, 2016 |
| Grant date | Feb 13, 2018 |
| Priority date | — |
| Expiry date | Nov 7, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2209/47
- WIPO fieldMedical technology
- WIPO sectorInstruments
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. The reader uses an ambient reading or other information to select a subset of the possible ring signal frequencies, and tunes or adjusts its circuits and algorithms to focus on that subset.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.