Apple Inc.

Bruce Andrew Doyle

Erick Omar Torres

Khaled M Alashmouny

Sunil Bhosekar

Suresh Balasubramanian

Sharath R Srinivasan

Chad O Lackey

Xiao Pu

A detector circuit included in a computer system filters the voltage level of a power supply node to generate filtered signals. The detector circuit either compares the filtered signals or samples the filtered signal and compares the samples to reference levels to detect changes in the voltage level of the power supply node that exceed thresholds for magnitude and duration. A control circuit included in the computer system generates, using the glitch signal, control signals that can be used to change operating parameters of functional circuits included in the computer system.

Power supply glitch detection

Systems, methods, and devices are provided for calibrating and correcting a clock duty cycle. An integrated circuit may include a clock tree that provides a clock signal and a circuit that is sensitive to clock duty cycle that receives the clock signal at a lower level of the clock tree. A first duty cycle correction circuit may adjust a clock duty cycle of the clock signal to a first target duty cycle at a higher level of the clock tree. A second duty cycle correction circuit may adjust a clock duty cycle of the clock signal to a second target duty cycle at the lower level of the clock tree.

Clock duty cycle correction

Growing community of inventors

Longmont, CO, United States of America

Bruce Andrew Doyle