Self-injection locking for low-power low-phase noise oscillators
AssigneeTexas Instruments Incorporated
InventorsBichoy Bahr, Baher Haroun, Ali Kiaei
Life of this patent
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Abstract
For producing a low-power, low-phase noise oscillating signal using a self-injection locking oscillator, examples include: producing, using an oscillator, a signal having a base frequency component and an Nth harmonic component, in which N is a selected integer and N>1; filtering the signal through a bandpass filter with Q factor ≥5, the filter configured to pass the Nth harmonic component as a filtered Nth harmonic component; and injecting the filtered Nth harmonic component into the oscillator to self-injection lock the base frequency of the signal.
Claims20
A method of producing a clock signal, the method comprising:
- a) producing, using an oscillator, a signal having a base frequency component and an Nth harmonic component, wherein N is an integer, and N>1;
- b) filtering the signal through a bandpass filter, in which the bandpass filter has Q factor ≥5 and passes the Nth harmonic component as a filtered Nth harmonic component;
- and
- c) injecting the filtered Nth harmonic component into the oscillator to self-injection lock the base frequency of the signal.
A self-injection locking clock circuit, comprising:
- a) an oscillator configured to output a periodic signal with at least a base frequency and configured to injection lock to an injected signal;
- and
- b) a bandpass filter having Q factor ≥5, the bandpass filter configured to pass an Nth harmonic of the base frequency to output a filtered Nth harmonic, N being an integer at least partially dependent on the base frequency, in which N>1, and the bandpass filter is operatively coupled to the oscillator and configured to filter the periodic signal to inject the filtered Nth harmonic into the oscillator.
Dependencies are inferred from the claim text.