Dynamic clock period modulation scheme for variable charge pump load currents
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United States of America Patent
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Mar 13, 2018
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app pub date -
May 28, 2015
filing date -
May 28, 2015
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Abstract
A charge pump is connected to receive a supply voltage and a clock signal and generate an output voltage. The charge pump is connected to the supply voltage through a transistor whose gate voltage is set by a regulation voltage determined by feedback from the output voltage. The current supplied to the charge pump through this transistor is mirrored in a section that generates the clock signal, where the mirrored current is used by a current controller oscillator. This allows the pump's clock frequency to linearly track the load current, improving the pump's efficiency.
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