Qualcomm Incorporated

Aniruddha Bashar

Charles D Tuten

Marko Harry Koski

Guolei Yu

Ajay Kumar Kosaraju

The present disclosure provides a duty locked loop circuit that includes a switch network including a first electronic switch device controlled by a first control signal that is based on a first input signal and a second electronic switch device controlled by a second control signal that is based on a second input signal. The duty locked loop circuit includes an integrator circuit electrically connected to the switch network. The integrator circuit is configured to generate an output voltage proportional to an integral of a difference between a first duty cycle of the first input signal and a second duty cycle of the second input signal. The duty locked loop circuit includes an output circuit configured to generate an output signal having an output duty cycle that is based on the output voltage.

Duty locked loop circuit

Certain aspects of the present disclosure provide an apparatus for noise cancellation. One example apparatus generally includes a first delay path and a second delay path, each providing signals generated by applying a different delay to an input signal, and a first comparator having a first input coupled to the first delay path and a second input coupled to the second delay path. The apparatus also includes a switching circuit having a control input coupled to an output of the first comparator, the switching circuit configured to selectively couple the first delay path or the second delay path to an output node of the switching circuit based on a signal at the control input. The apparatus also includes an attenuation circuit having a first input coupled to an input path for providing the input signal, and a second input coupled to the output node of the switching circuit.

Repetitive noise cancelation

In one embodiment, a circuit includes a first amplifier having a first differential input, a second differential input, and an output. The replica device is configured to generate a replica current of a current flowing through the battery where the first amplifier controls the control device to control the replica current. The circuit also includes a second amplifier having a third differential input, a fourth differential input, and an output. The second amplifier is configured to compensate for a first offset error of the first amplifier and a second offset error of the second amplifier based on selectively coupling the third differential input to the output of the first amplifier during a first phase, selectively coupling the output of the second amplifier to the second differential input during the first phase, and selectively coupling the output of the second amplifier to the fourth differential input during a second phase.

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Chandler, AZ, United States of America

Aniruddha Bashar