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公开(公告)号：US11139817B1
公开(公告)日：2021-10-05
申请号：US16855828
申请日：2020-04-22
Applicant: Apple Inc.
Inventor： Long Kong , Simone Gambini , Cristian Marcu , Nachum M. Kanovsky
Abstract: A computer system may periodically calibrate an oscillator subsystem, which includes a voltage-controlled oscillator circuit configured to generate an oscillator signal using code signal. In response to activation of a calibration mode, an iterative calibration operation may be performed on the voltage-controlled oscillator circuit. In some cases, performing a given iteration of the calibration operation includes determining a value of the code signal using a number of pulses in the oscillator signal sampled during a particular time period, along with previous values of the code signal and a slope of an error function associated with the difference between a desired frequency and a current frequency of the oscillator signal. In other cases, iterations may employ variable sampling times with error handling, in order to decrease the duration of the calibration operation while maintaining a target accuracy.
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公开(公告)号：US20210336624A1
公开(公告)日：2021-10-28
申请号：US16855828
申请日：2020-04-22
Applicant: Apple Inc.
Inventor： Long Kong , Simone Gambini , Cristian Marcu , Nachum M. Kanovsky
Abstract: A computer system may periodically calibrate an oscillator subsystem, which includes a voltage-controlled oscillator circuit configured to generate an oscillator signal using code signal. In response to activation of a calibration mode, an iterative calibration operation may be performed on the voltage-controlled oscillator circuit. In some cases, performing a given iteration of the calibration operation includes determining a value of the code signal using a number of pulses in the oscillator signal sampled during a particular time period, along with previous values of the code signal and a slope of an error function associated with the difference between a desired frequency and a current frequency of the oscillator signal. In other cases, iterations may employ variable sampling times with error handling, in order to decrease the duration of the calibration operation while maintaining a target accuracy.
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公开(公告)号：US10460702B2
公开(公告)日：2019-10-29
申请号：US15691687
申请日：2017-08-30
Applicant: Apple Inc.
Inventor： Nachum M. Kanovsky , Marc Albrecht , Tobias Jung , Xiaokai Li , Ameya Y. Joshi
Abstract: Aspects of the subject technology relate to display circuitry including pixel overdrive circuitry. The pixel overdrive circuitry includes a compression engine that compresses a previous display frame, for storage and comparison to a current display frame without compression or decompression of the current display frame. The compression engine compresses the previous frame in such a way that the maximum compression error is always known and can be used to determine whether to perform overdrive operations for the current frame without compressing and decompressing the current display frame. The compression engine selects gradient encoding or decimation encoding for the compression of the previous display frame and can perform successive decimation operations within the gradient encoding operations to help reduce the size of the compressed previous frame while maintaining the quality of the ultimate overdriven current frame.
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