Temperature-stable FBAR transmitter

A broadcasting unit comprising:

• an oscillator;
• a capacitor array coupled to the oscillator;
• a temperature sensor;
• a controller comprising a processor programmed to:
• calculate a frequency drift associated with the oscillator at a current temperature;
• based on the calculation, generate a first signal indicative of temperature compensation data;
• generate a second signal indicative of packet data and a modulation scheme;
• use the first signal and the second signal to generate a first tuning signal;
• and
• use the first tuning signal to tune the capacitor array such that (i) the oscillator generates a modulated RF signal indicative of the packet data and (ii) the modulated RF signal has a second frequency drift that is less than a threshold.

A system comprising:

• a sensor;
• a transceiver coupled to the sensor, the transceiver comprising:
• an oscillator comprising a thin-film bulk acoustic resonator (FBAR);
• a capacitor array coupled to the oscillator;
• a temperature sensor;
• and
• an antenna;
• a controller comprising a processor programmed to:
• calculate a frequency drift associated with the oscillator at a current temperature;
• based on the calculation, generate a first signal indicative of temperature compensation data;
• generate a second signal indicative of packet data and a modulation scheme;
• use the first signal and the second signal to generate a tuning signal;
• and
• use the tuning signal to tune the capacitor array such that (i) the oscillator generates a modulated RF signal indicative of the packet data and (ii) the modulated RF signal has a second frequency drift that is less than a threshold.