Direct frequency modulating radio-frequency sensors

A sensor system, comprising:

• a transceiver including a transceiver processor configured to execute a modulation receiver, and a transceiver antenna configured to transmit an interrogation signal generated by the modulation receiver;
• and
• a wearable radio frequency receiver device including a receiver radio antenna configured to receive the interrogation signal from the transceiver antenna, a sensor coupled to the receiver radio antenna and configured to receive a physiological input from a user wearing the device and generate an analog sensor signal based on the physiological input, and a modulator configured to perform direct frequency modulation on the received interrogation signal based on the analog sensor signal so as to generate a directly frequency modulated interrogation signal carrying an analog response, to encode the physiological input in the directly frequency modulated interrogation signal, wherein the receiver radio antenna is configured to emit at least a portion of the directly frequency modulated interrogation signal as reflected backscatter radiation carrying the analog response, wherein
• the transceiver antenna is configured to receive the directly frequency modulated interrogation signal, and the modulation receiver is configured to process the directly frequency modulated interrogation signal and output a decoded physiological input.

A sensor system comprising:

• a transceiver including a transceiver processor and a transceiver antenna configured to transmit an interrogation signal generated by the processor;
• and
• a wearable radio frequency receiver device including a receiver radio antenna configured to receive the interrogation signal from the transceiver antenna, a sensor coupled to the receiver radio antenna and configured to receive a physiological input from a user wearing the device and generate an analog sensor signal based on the physiological input, and a modulator configured to perform direct frequency modulation on the received interrogation signal based on the analog sensor signal so as to generate a directly frequency modulated interrogation signal carrying an analog response, to encode the physiological input in the directly frequency modulated interrogation signal, wherein the receiver radio antenna is configured to emit at least a portion of the directly frequency modulated interrogation signal as reflected backscatter radiation carrying the analog response, wherein
• the transceiver antenna is configured to receive the directly frequency modulated interrogation signal, and the processor is configured to process the directly frequency modulated interrogation signal and output a decoded physiological input.