Watch-crystal-based RF transmitter
AssigneeVerily Life Sciences LLC
InventorsDaniel Yeager, Amirpouya Kavousian
Life of this patent
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Abstract
Example radio frequency (RF) transmitters and associated methods are disclosed. One example RF transmitter includes an RF oscillator, a real-time clock (RTC) oscillator. and a control circuit. The control circuit is configured to determine whether a calibration of the RF oscillator is needed; electrically couple the RF oscillator to the RTC oscillator and initiate calibrating of the RF oscillator using the RTC oscillator when it is determined that the calibration is needed; and activate the RF oscillator to operate in an open-loop mode to generate an RF signal for data transmission. The calibration can be performed in a closed-loop mode before the data transmission or in an open-loop mode during the data transmission.
Claims29
A radio frequency (RF) transmitter comprising:
- an RF oscillator;
- a temperature sensor positioned to measure a temperature of the RF oscillator;
- a real-time clock (RTC) oscillator;
- and
- a control circuit configured to:
- obtain an operating temperature of the RF oscillator from the temperature sensor;
- and
- responsive to determining a calibration of the RF oscillator is needed based on at least one of the operating temperature of the RF oscillator or an elapsed time since the RF oscillator was last calibrated at the operating temperature:
- electrically couple the RF oscillator to the RTC oscillator;
- and
- initiate calibrating of the RF oscillator using the RTC oscillator;
- and
- activate the RF oscillator to operate in an open-loop mode to generate an RF signal for data transmission.
A wireless transmitter comprising:
- an inductor-capacitor (LC) oscillator;
- a real-time clock (RTC) oscillator selectively couplable to the LC oscillator;
- and
- a control circuit in communication with the LC oscillator and the RTC oscillator, the control circuit configured to:
- obtain an operating temperature of the LC oscillator from a temperature sensor;
- determine whether a calibration of the LC oscillator is needed based on at least one of:
- the operating temperature of the LC oscillator or an elapsed time since the LC oscillator was last calibrated at the operating temperature;
- responsive to a determination that the calibration of the LC oscillator is needed, electrically couple the RTC oscillator to the LC oscillator to form a closed loop;
- and
- initiate calibrating of the LC oscillator using the RTC oscillator in the closed loop.
A method comprising:
- receiving a request to transmit data using a radio frequency (RF) signal;
- obtaining an operating temperature of an inductor-capacitor (LC) oscillator for generating the RF signal;
- determining whether a calibration of the LC oscillator for generating the RF signal at a target frequency is needed based on at least one of:
- the operating temperature of the LC oscillator or an elapsed time since the LC oscillator was last calibrated at the operating temperature;
- responsive to a determination that the calibration of the LC oscillator is needed, electrically coupling a real-time clock (RTC) oscillator to the LC oscillator and initiating calibrating the LC oscillator at the operating temperature using the RTC oscillator;
- and
- activating the LC oscillator to generate the RF signal for data transmission.
Dependencies are inferred from the claim text.