Communicating with an implanted wireless sensor

A method for determining a resonant frequency of a wireless sensor, comprising:

• providing a calibration cycle, wherein the calibration cycle includes:
• generating an energizing signal;
• receiving a calibration signal;
• and
• determining a first relationship between the energizing signal and the calibration signal;
• and
• providing a measurement cycle, wherein the measurement cycle includes:
• energizing the wireless sensor;
• receiving a sensor signal from the wireless sensor;
• determining a second relationship between the sensor signal and the energizing signal;
• and
• using the first relationship and the second relationship to determine the resonant frequency of the wireless sensor.

A system for determining a resonant frequency of a wireless sensor, comprising:

• a transmitter for transmitting an energizing signal to the wireless sensor;
• a receiver for receiving a calibration signal during a calibration cycle and for receiving a sensor signal during a measurement cycle;
• and
• circuitry connected to the transmitter and the receiver for:
• determining a first relationship between the energizing signal and the calibration signal;
• and
• determining a second relationship between the sensor signal and the energizing signal;
• and
• determining the resonant frequency of the wireless sensor based on the first relationship and the second relationship.