Cmos integrated temperature insensitive, stable, and calibrated oscillator

A temperature insensitive oscillator system, comprising:

• a substrate having a first surface and an opposing second surface;
• a CMOS device comprising one or more CMOS circuits attached to the first surface of the substrate;
• one or more piezoelectric transducers attached to an outer surface of the CMOS device;
• a voltage-controlled oscillator generating a RF frequency, which is transmitted as a plurality of short pulses to the one or more piezoelectric transducers;
• and
• one or more resistors are arranged alongside the piezoelectric transducers or on the CMOS device such that the voltage-controlled oscillator has a controllable temperature dependence.

An oscillator with minimized dependence on temperature, comprising:

• a substrate having one or more transducers;
• a first oscillator configured to generate a RF frequency which excites the one or more transducers at their respective resonance frequencies;
• wherein the one or more transducers generate a sequence of RF pulses due to ultrasonic propagation in the bulk and transduction;
• and
• a second oscillator having a frequency based on the difference between two of the received pulses.