Reducing camera master clock desense
AssigneeAmazon Technologies, Inc.
InventorsZhibin Zhang, Amit Shailesh Gaikwad
Life of this patent
Estimating the term…
Abstract
Embodiments of the subject technology provide for controlling desense in a mobile computing device. At an application processor of a mobile computing device, a drive strength of an input clock signal is increased. The input clock signal with the increased drive strength is then provided to a filter circuit that performs low-pass filtering to block high frequency RF and EMI noise from the input clock signal. The filtered input clock signal is provided to respective camera clock units of a front-facing camera or a rear-facing camera of the mobile computing device for operating the front-facing and rear-facing cameras.
Claims20
A computer-implemented method comprising:
- receiving, at an application processor of a mobile computing device, an input clock signal, the input clock signal having a first drive strength and being associated with a camera of the mobile computing device;
- detecting, by the mobile device, concurrent usage of the camera and a radio frequency antenna for transmission or reception;
- responsive to detecting the concurrent usage of the camera and the radio frequency antenna, increasing the first drive strength of the input clock signal to a second drive strength;
- providing the input clock signal with the second drive strength as a master clock signal to a filter circuit;
- filtering the master clock signal to pass a first set of frequencies below a cutoff frequency and attenuating a second set of frequencies above the cutoff frequency, wherein the master clock signal is filtered at the cutoff frequency, wherein the cut-off frequency is substantially close to a fundamental frequency of the master clock signal;
- and
- providing the filtered master clock signal to a camera clock unit of the camera of the mobile computing device.
A apparatus comprising:
- a clock generator and drive strength control unit, the clock generator and drive strength control unit configured to increase a drive strength of a master clock signal from a first drive strength to a second drive strength in response to concurrent usage of a camera and a radio frequency component of the apparatus;
- a filter circuit coupled to the clock generator and drive strength control unit, the filter circuit configured to perform low-pass frequency filtering on the master clock signal to provide a filtered master clock signal, wherein the low-pass frequency filtering filters the master clock signal at a cutoff frequency that is substantially close to a fundamental frequency of the master clock signal;
- and
- a first camera clock unit coupled to the filter circuit and the camera, the first camera clock unit configured to receive the filtered master clock signal.
A non-transitory computer-readable medium including instructions stored therein that, when executed by at least one computing device, cause the at least one computing device to perform a set of operations comprising:
- receiving, at an application processor of a mobile computing device, an input clock signal, the input clock signal having a first drive strength and being associated with a camera of the mobile computing device;
- detecting, by the mobile device, concurrent usage of the camera and a radio frequency antenna for transmission or reception;
- responsive to detecting the concurrent usage of the camera and the radio frequency antenna, increasing the first drive strength of the input clock signal to a second drive strength;
- providing the input clock signal with the second drive strength as a master clock signal to a filter circuit;
- filtering the master clock signal to pass a first set of frequencies below a cutoff frequency and attenuating a second set of frequencies above the cutoff frequency, wherein the master clock signal is filtered at the cutoff frequency, wherein the cut-off frequency is substantially close to a fundamental frequency of the master clock signal;
- and
- providing the filtered master clock signal to a camera clock unit of the camera of the mobile computing device.
Dependencies are inferred from the claim text.