A control system for a digitally controlled oscillator with temperature compensation including a loop detector providing an error value, filter circuitry providing a lower resolution digital value to the DCO to generate an output oscillation signal at a frequency within a lower resolution range, tracking circuitry holding a tracking digital value at a tracking offset from center of a tracking range while the lower resolution digital value is being determined, and then regulating the frequency within a higher resolution range by adjusting the tracking digital value, temperature compensation circuitry performing temperature compensation steps to maintain the tracking digital value between first and second thresholds within the predetermined tracking range, and a controller configured to set the first and second thresholds within a narrow range around the tracking offset during a standard operating mode, and to adjust one or both thresholds within a wide range during a critical operating mode.

A ratiometric current source circuit having a reduced temperature dependence is disclosed. An embodiment of the current source circuit includes a first divider circuit configured to generate a reference voltage using a voltage level of a power supply node and a second divider circuit including a first resistor with a first temperature coefficient and a second resistor with a second temperature coefficient. The first resistor is configured to generate a first current using an input voltage and the voltage level of the power supply node and the second resistor is configured to generate a second current using the input voltage. The embodiment further includes a buffer circuit configured to generate the input voltage using the reference voltage and generate an output current using a difference between the first current and the second current.

A temperature insensitive oscillator system. The system includes a substrate having a first surface and an opposing second surface, a CMOS device with 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 delays and oscillators using resistor and active components arranged alongside the piezoelectric transducers or on the CMOS device such that the voltage-controlled oscillator has minimal dependence on temperature, and has minimal deviation from a programmed frequency.

An oscillation circuit includes: a power supply generation module and an oscillator. The power supply generation module is configured to generate a positive temperature coefficient voltage based on a positive temperature coefficient current; and the positive temperature coefficient voltage serves as a power supply of the oscillator. The oscillator includes: a first ring topological structure and a second ring topological structure. The first ring topological structure is formed by a plurality of first inverters connected end to end and configured to transmit an oscillation signal at a first transmission speed; and the second ring topological structure is formed by a plurality of second inverters connected end to end and configured to transmit the oscillation signal at a second transmission speed. The first ring topological structure is electrically connected with the second ring topological structure, and the second transmission speed is less than the first transmission speed.

An oscillator includes dual resonators mounted in a helium filled coldweld holder. One resonator operates at anti-resonance into a load capacitance of about 20 picofarads, and operates on a third overtone frequency under noncontrolled temperature conditions. The other resonator operates on a fundamental mode at anti-resonance in a load capacitance of about 32 picofarads. Resonator crystals in a dual-crystal resonator may include a theta-angle shift to equalize frequency versus temperature curves at temperature extremes.

In one aspect, a method of adjusting a first oscillating signal, includes generating a relationship prediction responsive to a deep learning model configured to predict a relationship between a fundamental quantity of a first oscillating signal and a fundamental quantity of a second oscillating signal, and applying an adjustment to the first oscillating signal responsive to the relationship prediction to produce an adjusted oscillating signal, wherein the adjusted oscillating signal replaces the second oscillating signal.

A reference frequency signal generator comprises a plurality of ovenized reference crystal oscillators (OCXOs) having different turn-over-temperatures, a selector logic circuit coupled to outputs of the OCXOs, a temperature sensor, and a controller coupled to an output of the temperature sensor. The selector logic circuit outputs one of the outputs of the OCXOs based on a control signal from the controller. The controller also generates control signals for the OCXOs. In some implementations, the reference frequency signal generator includes a phase-locked loop or a fractional output divider coupled to the output of the selector logic circuit and configured to receive a calibration signal from the controller.

An oscillator assembly includes a scribe seal, an oscillator circuit, and a calibration circuit. The oscillator circuit includes an output. The calibration circuit is coupled to the oscillator circuit. The calibration circuit includes a reference frequency terminal, a conductor coupled to the reference frequency terminal, and an oscillator input terminal. The conductor extends to an edge of the oscillator circuit assembly and penetrates the scribe seal. The oscillator input terminal is coupled to the output of the oscillator circuit.

An embodiment of the present disclosure relates to a device comprising an electronic circuit; an oscillation circuit comprising a quartz crystal, configured to provide a clock signal to the electronic circuit; and a heater configured to increase the temperature of the quartz crystal.

An oscillator includes: a resonator; a heat generation circuit configured to heat the resonator; a temperature sensor positioned closer to the heat generation circuit than the resonator is and configured to output a temperature detection signal; a temperature control circuit configured to output a temperature control signal for controlling a temperature of the heat generation circuit based on the temperature detection signal; an oscillation clock signal output circuit configured to oscillate the resonator and output an oscillation clock signal; and a correction circuit configured to correct a frequency variation of the oscillation clock signal, in which the correction circuit is configured to compensate for a transient frequency variation of the oscillation clock signal based on a time change amount of the temperature detection signal or a time change amount of the temperature control signal.