Apple Inc.

Mahdi Forghani

David M Signoff

Ahmed I Hussein

An electronic device may include wireless circuitry having mixer circuitry configured to receive an oscillator signal from phase-locked loop circuitry. The phase-locked loop circuitry may include a digital or analog phase-locked loop having a first frequency divider, a ring oscillator, and an auxiliary phase noise cancellation loop coupled to the ring oscillator. The auxiliary phase noise cancellation loop may include at least a time-to-digital converter, a second frequency divider, an amplifier, and a bandpass filter configured to reject thermal and quantization noise associated with the time-to-digital converter. The first frequency divider may have a first division ratio, whereas the second frequency divider may have a second division ratio that is less than the first division ratio to provide faster phase noise correction.

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Los Angeles, CA, United States of America

Mahdi Forghani