Charge pumps having variable gain and variable frequency
AssigneeQUALCOMM Incorporated
InventorsSeyed Mahmoudreza Saadat, Chunlei Shi, Chenchang Zhan
Life of this patent
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Abstract
In one embodiment, a circuit comprises a charge pump. A gain control circuit is configured to detect an input voltage and generate a gain control signal to change a gain of the charge pump to maintain the output voltage of the charge pump in a voltage range. A voltage to frequency converter is configured to detect the input voltage and change a frequency of a frequency control signal applied to the charge pump based in the detected input voltage to maintain the frequency in a frequency range so that the output voltage of the charge pump is maintained in the voltage range.
Claims19
A circuit comprising:
- a charge pump;
- a gain control circuit configured to detect an input voltage and generate a gain control signal to change a gain of the charge pump to maintain the output voltage of the charge pump in a voltage range;
- and
- a voltage to frequency converter configured to detect the input voltage and change a frequency of a frequency control signal applied to the charge pump based in the detected input voltage to maintain the frequency in a frequency range so that the output voltage of the charge pump is maintained in the voltage range.
A circuit comprising:
- a charge pump including an input for receiving an input voltage and having an output for providing an output voltage based on the input voltage, the charge pump having a selectable gain in response to a gain control signal and a gain in response to a frequency control signal;
- a gain control circuit configured to detect the input voltage and generate the gain control signal to select the gain of the charge pump to maintain the output voltage of the charge pump in a voltage range;
- and
- a frequency control circuit configured to detect the input voltage and generate the frequency control signal to maintain the frequency in a frequency range so that the output voltage of the charge pump is maintained in the voltage range.
A method comprising:
- detecting an input voltage to control a gain, a frequency, and an output voltage of a charge pump;
- changing the gain of the charge pump to maintain the output voltage of the charge pump in a voltage range;
- and
- changing a frequency of a control signal applied to the charge pump based on the detected input voltage to maintain the frequency in a frequency range so that the output voltage of the charge pump is maintained in the voltage range.
Dependencies are inferred from the claim text.