Dynamic clock period modulation scheme for variable charge pump load currents
First Claim
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1. A charge pump system, comprising:
- a charge pump configured to generate an output voltage potential at an output node by use of a clock signal and a supply current; and
a clock circuit configured to produce the clock signal for the charge pump, the clock circuit comprising;
a current mirroring element configured to generate a first current having a magnitude that is substantially a fraction of a magnitude of the supply current to the charge pump, anda current controlled oscillator configured to produce the clock signal for the charge pump based on the magnitude of the first current such that a frequency of the clock signal varies with the magnitude of the supply current to the charge pump.
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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.
333 Citations
21 Claims
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1. A charge pump system, comprising:
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a charge pump configured to generate an output voltage potential at an output node by use of a clock signal and a supply current; and a clock circuit configured to produce the clock signal for the charge pump, the clock circuit comprising; a current mirroring element configured to generate a first current having a magnitude that is substantially a fraction of a magnitude of the supply current to the charge pump, and a current controlled oscillator configured to produce the clock signal for the charge pump based on the magnitude of the first current such that a frequency of the clock signal varies with the magnitude of the supply current to the charge pump. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method, comprising:
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generating an output voltage potential by a charge pump circuit, wherein the charge pump circuit generates the output voltage potential responsive to a pump clock signal and by use of supply current; mirroring the supply current being supplied to the charge pump circuit to generate the output voltage potential, wherein mirroring the supply current comprises generating a first current, the first current having a level configured to be substantially fractional to a level of the supply current being supplied to the charge pump circuit; and generating the pump clock signal by use of the first current, wherein generating the pump clock signal comprises adapting a frequency of the pump clock signal based upon the level of the first current such that the frequency of the pump clock signal is dependent upon the level of the supply current being supplied to the charge pump circuit. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A system, comprising:
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means for mirroring a supply current to a charge pump, the charge pump configured to generate an output voltage potential on an output node by use of the supply current and a clock signal, wherein mirroring the supply current comprises generating a mirrored supply current having a magnitude that is a fraction of a magnitude of the supply current to the charge pump; and means for producing the clock signal for the charge pump using the mirrored supply current, wherein a frequency of the clock signal corresponds to the magnitude of the mirrored supply current such that the frequency of the clock signal varies with the magnitude of the supply current to the charge pump. - View Dependent Claims (21)
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Specification