Qualcomm Incorporated

Shraddha Sridhar

Yeshwant Nagaraj Kolla

Jeffrey Todd Bridges

Burt Lee Price

Vaishnav Srinivas

Sanjay Bhikhubhai Patel

Jan Christian Diffenderfer

Gabriel Martel Tarr

Michael Thomas Fertsch

Neel Shashank Natekar

Guneet Singh

Adaptively controlling drive strength of multiplexed power from supply power rails in a power multiplexing system to a powered circuit is disclosed. A power multiplexing circuit in the power multiplexing system includes a plurality of supply selection circuits (e.g., head switches) each coupled between a respective supply power rail and an output power rail coupled to the powered circuit. The power multiplexing circuit is configured to activate a selected supply selection circuit to switch coupling of an associated supply power rail to the output power rail to power the powered circuit. In one example, the supply selection circuits each include a plurality of power switch selection circuits coupled to an associated supply power rail. The power switch selection circuits are configured to be activated and deactivated by a control circuit to adjust drive strength of a multiplexed supply power rail based on operational conditions, which can account for performance variations.

Adaptively controlling drive strength of multiplexed power from supply power rails in a power multiplexing system to a powered circuit

Adaptive voltage modulation circuits for adjusting supply voltage to reduce supply voltage droops and minimize power consumption are provided. In one aspect, an adaptive voltage modulation circuit detects a supply voltage droop by detecting when a supply voltage falls below a droop threshold voltage, and adjusts a clock signal provided to a load circuit in response to a supply voltage droop. The adaptive voltage modulation circuit keeps a count of the number of clock signal cycles during which the supply voltage is below the droop threshold voltage. The adaptive voltage modulation circuit increases the supply voltage in response to the count exceeding an upper threshold value, and decreases the supply voltage in response to the count being less than a lower threshold value at an end of a defined period. The adaptive voltage modulation circuit can reduce the time a load circuit operates with reduced frequency while minimizing power consumption.

Adaptive voltage modulation circuits for adjusting supply voltage to reduce supply voltage droops and minimize power consumption

Programmable delay circuits are described herein according to embodiments of the present disclosure. In one embodiment, a delay circuit comprises a plurality of delay stages coupled in series. Each of the delay stages comprises a delay gate on a forward path of the delay circuit, wherein the delay gate is configured to pass or block a signal on the forward path depending on a logic state of a respective select signal. Each of the delay stages also comprises a multiplexer on a return path of the delay circuit, wherein the multiplexer is configured to pass a signal on the return path or route the signal on the forward path to the return path depending on the logic state of the respective select signal. Output logic states of the delay gates and the multiplexers may remain static during a change in the delay setting of the delay circuit to reduce glitch.

Programmable delay circuit for low power applications

A duty cycle correction circuit includes a rising edge variable delay circuit and a falling edge variable delay circuit. The variable delay for each delay circuit depends upon an uncorrected duty cycle for an uncorrected clock signal being corrected by the duty cycle correction circuit into a corrected clock signal having a desired duty cycle.

Wide-band duty cycle correction circuit

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Raleigh, NC, United States of America

Shraddha Sridhar