Charge pump current adjustment
AssigneeFujitsu Limited
InventorNikola Nedovic
Life of this patent
Estimating the term…
Abstract
A charge pump circuit may include an output node, a current source circuit, a current sink circuit, a first amplifier circuit, and a second amplifier circuit. The current source circuit may be configured to source current to the output node. The current sink circuit may be configured to sink current from the output node. The first amplifier circuit may be configured to adjust a first amount of current sourced by the current source circuit based on a voltage on the output node. The second amplifier circuit may be configured to adjust the first amount of current sourced by the current source circuit or a second amount of current sunk by the current sink circuit based on the voltage on the output node.
Claims14
A charge pump circuit, comprising:
- an output node;
- a current source circuit configured to source current to the output node;
- a current sink circuit configured to sink current from the output node;
- a first amplifier circuit configured to adjust a first amount of current sourced by the current source circuit based on a voltage on the output node, the first amplifier circuit having a first range of operation with respect to the voltage on the output node and the first range of operation of the first amplifier circuit having a limit at ground;
- and
- a second amplifier circuit configured to adjust one of the first amount of current sourced by the current source circuit and a second amount of current sunk by the current sink circuit, the adjusting based on the voltage on the output node, the second amplifier circuit having a second range of operation with respect to the voltage on the output node and the second range of operation of the second amplifier circuit having a limit at a supply voltage of the charge pump circuit, wherein the first and second ranges of operation overlap.
A charge pump circuit, comprising:
- an output node;
- a current input node configured to provide a supply current;
- a first current mirror circuit configured to source current to the output node based on the supply current;
- a second current mirror circuit configured to sink current from the output node based on the supply current;
- and
- an inverter circuit configured to adjust an amount of current sourced by the first current mirror circuit based on a voltage on the output node, the inverter circuit including:
- a first amplifier circuit that has a first range of operation with respect to the voltage on the output node, the first range of operation of the first amplifier circuit having a limit at ground;
- and
- a second amplifier circuit that has a second range of operation with respect to the voltage on the output node, the second range of operation of the second amplifier circuit having a limit at a supply voltage of the charge pump circuit,
- wherein the first and second ranges of operation overlap.
A method, comprising:
- adjusting a first amount of current sourced to an output node of a charge pump circuit based on a voltage on the output node, the adjustment of the first amount of current sourced to the output node directed by a first amplifier circuit that has a first range of operation with respect to the voltage on the output node and the first range of operation of the first amplifier circuit has a limit at ground;
- and
- adjusting a second amount of current sunk from the output node of the charge pump circuit based on the voltage on the output node, the adjustment of the second amount of current sunk from the output node directed by a second amplifier circuit that has a second range of operation with respect to the voltage on the output node, the second range of operation of the second amplifier circuit has a limit at a supply voltage of the charge pump circuit, and the first and second ranges of operation overlap.
Dependencies are inferred from the claim text.