Charge pump circuit and power-supply method for dynamically adjusting output voltage
AssigneeRealtek Semiconductor Corp.
InventorChih-Kang Chien
Life of this patent
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Abstract
A charge pump circuit and power-supply method for dynamically adjusting output voltage is related to the charge pump circuit having three power-supply modes with different power conversion efficiencies. When supplying power, a pump unit controls the electrical connecting relations of a first flying capacitor, second flying capacitor, first storage capacitor and second storage capacitor through a first clock and second clock with non-overlapping working phases, to convert a source voltage into a positive output voltage and negative output voltage, thereby providing one of the three power-supply modes.
Claims12
A charge pump circuit, comprising:
- a power receiving end, for receiving a source voltage;
- a ground end;
- a positive output end, for outputting a positive output voltage;
- a negative output end, for outputting a negative output voltage;
- a first storage capacitor, coupled between the positive output end and the ground end;
- a second storage capacitor, coupled between the negative output end and the ground end;
- a first flying capacitor;
- a second flying capacitor;
- a pump unit, for controlling at least a connection relation of the first flying capacitor, the second flying capacitor, the first storage capacitor, and the second storage capacitor according to a first clock and a second clock with non-overlapping working phases, to convert the source voltage into the positive output voltage and the negative output voltage, thereby providing one of a first power-supply mode, a second power-supply mode and a third power-supply mode with different power conversion efficiencies;
- and
- an amplitude detector, for detecting an amplitude of an input signal or an output signal of a post-stage circuit powered with the positive output voltage and the negative output voltage, so as to select one of the three power-supply modes of the pump unit;
- wherein the amplitude detector selects the first power-supply mode when the amplitude is smaller than a first threshold, the amplitude detector selects the second power-supply mode when the amplitude is higher than the first threshold and smaller than a second threshold, and the amplitude detector selects the third power-supply mode when the amplitude is higher than the second threshold.
A power-supply method for dynamically adjusting output voltage, comprising:
- receiving a source voltage;
- selecting one of a first power-supply mode, a second power-supply mode and a third power-supply mode with different power conversion efficiencies according to an amplitude of an input signal;
- and
- controlling at least a connection relation according to a first clock and a second clock with non-overlapping working phases, to convert the source voltage into a positive output voltage and a negative output voltage corresponding to the selected power-supply mode for powering a post-stage circuit received the input signal,
- wherein the selecting step comprises:
- selecting the first power-supply mode when the amplitude is smaller than a first threshold;
- selecting the second power-supply mode when the amplitude is higher than the first threshold and smaller than a second threshold;
- and
- selecting the third power-supply mode when the amplitude is higher than the second threshold.
Dependencies are inferred from the claim text.