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Apparatus and methods for charge pumps for radio frequency systems

  • US 9,729,048 B2
  • Filed: 08/03/2015
  • Issued: 08/08/2017
  • Est. Priority Date: 08/04/2014
  • Status: Active Grant
First Claim
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1. A charge pump comprising:

  • a mode control circuit configured to operate the charge pump in a selected mode chosen from a plurality of modes;

    a clock generation circuit configured to generate a charge pump clock signal having an oscillation frequency that is based on the selected mode, the charge pump clock signal having a first phase and a second phase;

    two or more switched capacitors including a first switched capacitor and a second switched capacitor; and

    a capacitor charging circuit configured to charge the two or more switched capacitors based on a power high supply voltage of the capacitor charging circuit and on timing of the charge pump clock signal, the capacitor charging circuit configured to charge a first end of the first switched capacitor with the power high supply voltage and a second end of the first switched capacitor with a power low supply voltage during the first phase, and to charge a first end of the second switched capacitor with the power high supply voltage and a second end of the second switched capacitor with the power low supply voltage during the second phase, the power high supply voltage having a voltage level that is based on the selected mode.

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