An apparatus is provided which comprises: a first ring oscillator comprising at least one aging tolerant circuitry; a second ring oscillator comprising a non-aging tolerant circuitry; a first counter coupled to the first ring oscillator, wherein the first counter is to count a frequency of the first ring oscillator; a second counter coupled to the second ring oscillator, wherein the second counter is to count a frequency of the second ring oscillator; and logic to compare the frequencies of the first and second ring oscillators, and to generate one or more controls to mitigate aging of one or more devices.

A low power crystal oscillator circuit has a high power part and a low power part. Crystal oscillation is initialized using the high power part. An automatic amplitude control circuit includes a current subtractor that decreases current in the high power part as an amplitude of the crystal oscillation increases. A current limiting circuit may limit current in the low power part in order to further reduce power consumption by the low power crystal oscillator circuit. Additionally, an automatic amplitude detection circuit may turn off the high power part after the amplitude of the crystal oscillation reaches a predetermined level in order to further reduce power consumption of the low power crystal oscillator circuit, and may turn back on the high power part after the amplitude of the crystal oscillation reaches a second predetermined level in order to maintain the crystal oscillation.

A first current source charges a capacitor. A second current source supplies a current to an input node of an inverter. A current mirror circuit has its output node coupled to an input node of the inverter. A resistor is coupled between the input node of the current mirror circuit and the capacitor.

A crystal oscillator and a method are provided for adjusting an oscillation frequency. The crystal oscillator includes: a first oscillator circuit, a frequency control circuit and a crystal; where the first oscillator circuit is configured to output a first drive signal having a first oscillation frequency to drive the crystal, and the frequency control circuit is configured to determine a frequency control amount according to a feature of an electrical signal flowing through the crystal under driving of the first drive signal, and adjust the first oscillation frequency according to the frequency control amount. When the technical solutions are applied to scenarios where the crystal oscillator is enabled to quickly en-oscillate, a natural en-oscillation cycle of the crystal oscillator may be shortened, and the en-oscillation speed is increased.

A stabilized oscillator which comprises a ring oscillator with an odd number of inverters. The output of an inverter is driving a capacitor and the input of the a next inverter. A feedback element is configured for generating a first and a second current with a fixed current ratio between both, and for applying the same voltage over the ring oscillator as over a resistor which is connected in parallel with a current compensator. The first current goes through the parallel connection, the second current goes through the ring oscillator. The current compensator is configured such that the ratio of the current through the current compensator and a parasitic current component of the second current is substantially equal to the ratio of the first and second current.

Embodiments can provide individualized controlling of noise injection during startup of a crystal oscillator. In some embodiments, a simple learning block can be placed in parallel to a crystal oscillator circuit to control noise injection during the startup of the crystal oscillator. The learning block can be configured to control the noise injection during the startup of the crystal oscillator by determining whether the crystal oscillator has been stabilized. In some implementations, an adjustment block may be employed to adjust the count determined by the learning block based on one or more characteristics of the crystal oscillator during a startup of the crystal oscillator. In some embodiments, a simple block that creates a negative capacitance can be configured in parallel to the crystal oscillator.

An apparatus is provided which comprises: a first ring oscillator comprising at least one aging tolerant circuitry; a second ring oscillator comprising a non-aging tolerant circuitry; a first counter coupled to the first ring oscillator, wherein the first counter is to count a frequency of the first ring oscillator; a second counter coupled to the second ring oscillator, wherein the second counter is to count a frequency of the second ring oscillator; and logic to compare the frequencies of the first and second ring oscillators, and to generate one or more controls to mitigate aging of one or more devices.

Provided is an electronic device includes an oscillator circuit that outputs a clock signal of predetermined frequency, a clock circuit that counts date and time in accordance with input of the clock signal, a temperature sensor that measures a temperature relating to a change of the predetermined frequency, a receiver that receives a radio wave from a positioning satellite, and a first processor and/or a second processor. The first processor and/or the second processor estimates an amount of time count difference in date and time counted by the clock circuit on the basis of a history of temperatures measured by the temperature sensor, and combines date and time counted by the clock circuit, the estimated amount of time count difference, and part of date-and-time information obtained from a radio wave received by the receiver to identify current date and time.

Embodiments of an integrated circuit (IC) comprising circuitry to determine settings for an injection-locked oscillator (ILO) are described. In some embodiments, an injection signal is generated based on a first clock edge of a reference clock signal, and is injected into an ILO. Next, one or more output signals of the ILO are sampled based on a second clock edge of the reference clock signal, and settings for the ILO are determined based on the samples. In some embodiments, a sequence of two or more time-to-digital (TDC) codes is generated based on a reference clock signal and a free-running ILO. In some embodiments, the TDC circuitry that is already present in a delay-locked loop is reused for determining the sequence of two or more TDC codes. The ILO settings can then be determined based on the sequence of two or more TDC codes.

A fast start-up oscillator circuit to reduce a start-up time of a crystal oscillator is presented. The circuit contains a crystal resonator to output a first oscillation signal and a tunable RC oscillator to output a second oscillation signal. A driver is coupled between the tunable RC oscillator and the crystal resonator The driver transfers the second oscillation signal output from the tunable RC oscillator to the crystal resonator. The driver drives the crystal resonator, and a feedback circuit connected between the crystal resonator and the tunable RC oscillator to align a phase of the tunable RC oscillator with a phase of the crystal resonator based on the oscillation signal output by the crystal resonator.