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US 2012/0068774 A1Published application
Amplitude Control for Oscillator
AssigneeQUALCOMM Incorporated
InventorsZhiqin Chen, Nam V. Dang, Nan Chen, Thuan Ly
Life of this patent
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Abstract
An amplitude control circuit includes a pair of peak detectors. The pair of peak detectors are responsive to a voltage reference generator. The amplitude control circuit is configured to be responsive to an oscillating signal of a crystal oscillator and configured to generate a control signal to control an amplitude of the oscillating signal.
Claims41
An apparatus comprising:
- an amplitude control circuit comprising a pair of peak detectors, the pair of peak detectors responsive to a voltage reference generator, and
- wherein the amplitude control circuit is configured to be responsive to an oscillating signal of a crystal oscillator and configured to generate a control signal to control an amplitude of the oscillating signal.
A method, comprising:
- generating a control signal to control a gain of an amplifier of an oscillator, wherein the control signal is generated based on a comparison between a first peak voltage and a second peak voltage, wherein the first peak voltage is detected at a first peak detector responsive to an amplitude of a signal and wherein the second peak voltage is detected at a second peak detector responsive to a voltage reference generator.
An apparatus comprising:
- a first transistor configured to be coupled to a crystal oscillation circuit;
- and
- an amplitude control circuit configured to adaptively control an amplitude of a current to be applied to the first transistor, the amplitude control circuit comprising first and second voltage peak detectors and an input coupled to receive an oscillating signal associated with the crystal oscillation circuit.
A method, comprising:
- detecting a first peak voltage of a first reference voltage signal at a first peak detector;
- detecting a second peak voltage of a second reference voltage signal at a second peak detector, wherein the first reference voltage signal and the second reference voltage signal are based on an oscillating signal associated with a crystal oscillator;
- and
- generating a control signal to adaptively control an amplitude of a current to be applied to a first transistor, wherein the control signal is generated based on the first peak voltage and the second peak voltage.
1 more element
An apparatus comprising:
- means for amplifying an oscillating signal of a crystal oscillation circuit;
- and
- means for adaptively controlling an amplitude of a current to be applied to the means for amplifying, the means for adaptively controlling the amplitude comprising:
- means for detecting a first peak voltage corresponding to the oscillating signal;
- and
- means for detecting a second peak voltage corresponding to a reference voltage.
3 more elements
A method comprising:
- a step for detecting a first peak voltage of a first reference voltage signal at a first peak detector;
- a step for detecting a second peak voltage of a second reference voltage signal at a second peak detector, wherein the first reference voltage signal and the second reference voltage signal are based on an oscillating signal associated with a crystal oscillator;
- and
- a step for generating a control signal to adaptively control an amplitude of a current to be applied to a first transistor, wherein the control signal is generated based on the first peak voltage and the second peak voltage.
1 more element
A non-transient computer readable tangible medium storing instructions executable by a computer, the instructions comprising:
- instructions that are executable by the computer to generate a control signal to control a gain of an amplifier of an oscillator, wherein the control signal is generated based on a comparison between a first peak voltage and a second peak voltage, wherein the first peak voltage is detected at a first peak detector responsive to an amplitude of a signal of the oscillator and wherein the second peak voltage is detected at a second peak detector responsive to a voltage reference generator.
A method comprising:
- receiving a data file comprising design information corresponding to a semiconductor device;
- and
- fabricating the semiconductor device according to the design information, wherein the semiconductor device comprises:
- a first transistor configured to be coupled to a crystal oscillation circuit;
- and
- an amplitude control circuit configured to adaptively control an amplitude of a current to be applied to the first transistor, the amplitude control circuit comprising first and second voltage peak detectors and an input to receive an oscillating signal associated with the crystal oscillation circuit.
3 more elements
Dependencies are inferred from the claim text.