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公开(公告)号：US11031943B1
公开(公告)日：2021-06-08
申请号：US16811459
申请日：2020-03-06
Applicant: Apple Inc.
Inventor： Simone Gambini , Chin-Chi Chen , Axel D. Berny
Abstract: A frequency synthesizer circuit included in a sensor circuit of a computer system may include a voltage-controlled oscillator circuit that may generate an oscillator signal. A three-point injection technique may be used to modulate the frequency of the oscillator signal. The three-point injection includes a low-frequency component that drives a feedback divider, and two high-frequency components that drive the voltage-controlled oscillator circuit. The strengths of the three injection points are aligned using samples of a tune signal generated using results of a comparison of a referenced signal and a frequency divided version of the oscillator signal.
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