Devices and methods of cancelling the switching noise from power management integrated circuits
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United States of America Patent
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Jun 5, 2018
Issued Date -
May 26, 2016
app pub date -
Aug 19, 2015
filing date -
Nov 24, 2014
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Abstract
A power management device includes a first power unit, a second power unit, and a control unit. The first power unit receives a first control signal of a first phase to generate a first current of the first phase flowing to an output node. The second power unit receives a second control signal of a second phase to generate a second current of the second phase flowing to the output node. A phase delay is the difference between the first phase and the second phase. The control unit receives a clock signal in a clock frequency to generate the first control signal and the second control signal. The control unit controls the phase delay to cancel a corresponding harmonic of the clock frequency at the output node.
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