US 10,763,785 B2 · Fast startup time for crystal oscillator

Abstract

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.

Claims20

Dependent claims

A circuit configured for controlling a startup for an oscillator circuit, the circuit comprising:

a learning block configured to:
obtain an oscillation level of a crystal element in the oscillator circuit during a startup of the crystal element;
when the oscillation level is at a predetermined threshold or slightly above the predetermined threshold:
reset a count of the learning block to the predetermined threshold;
and
start incrementing the count by clock cycles;
and
when the oscillation level the crystal element has reached a predetermined target oscillation level, stop the count;
and, wherein
the learning block is configured for deactivating negative capacitance generation for the oscillator circuit, wherein the count is accessible for controlling the deactivation of the negative capacitance generation.

7 more elements

A method for controlling deactivation of noise injection during a startup for an oscillator circuit, the method being implemented by a circuit comprising a learning block, the circuit being operatively connected to the oscillator circuit, the method comprising:

obtaining an oscillation level of a crystal element in the oscillator circuit during a startup of the crystal element;
when the oscillation level is at a predetermined threshold or slightly above the predetermined threshold:
resetting a count of the learning block to the predetermined threshold;
and
starting incrementing the count by clock cycles;
and
when the oscillation level the crystal element has reached the predetermined target oscillation level, stopping the count;
and, wherein
the learning block is configured for deactivating negative capacitance generation for the oscillator circuit, wherein the count is accessible for controlling the deactivation of the negative capacitance generation.

6 more elements

Dependencies are inferred from the claim text.

Fast startup time for crystal oscillator

Life of this patent

Fast startup time for crystal oscillator

Life of this patent

Abstract

Claims20