Charging and discharging circuits for assisting charge pumps
AssigneeSkyworks Solutions, Inc.
InventorGuillaume Alexandre Blin
Life of this patent
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Abstract
Charging and discharging circuits for assisting charge pumps are disclosed. In certain embodiments, a radio frequency (RF) switch system includes an RF switch that receives an RF signal and is controlled by a switch control signal received at an input, a first charge pump configured to generate a first charge pump voltage, a level shifter powered by the first charge pump voltage and that generates the switch control signal based on a switch enable signal, and a charge pump assistance switch coupled to the input of the radio frequency switch and that activates to assist the first charge pump in response to a transition of the switch enable signal from a first state to a second state.
Claims20
A mobile device comprising:
- a power management system including a first charge pump configured to generate a first charge pump voltage;
- and
- a front end system including a radio frequency switch configured to receive a radio frequency signal and to be controlled by a switch control signal received at an input, a level shifter powered by the first charge pump voltage and configured to generate the switch control signal based on a switch enable signal, and a charge pump assistance switch coupled to the input of the radio frequency switch and configured to activate to assist the first charge pump in response to a transition of the switch enable signal from a first state to a second state.
A radio frequency switch system comprising:
- a radio frequency switch configured to receive a radio frequency signal and to be controlled by a switch control signal received at an input;
- a first charge pump configured to generate a first charge pump voltage;
- a level shifter powered by the first charge pump voltage and configured to generate the switch control signal based on a switch enable signal;
- and
- a charge pump assistance switch coupled to the input of the radio frequency switch and configured to activate to assist the first charge pump in response to a transition of the switch enable signal from a first state to a second state.
A method of level shifting in a mobile device, the method comprising:
- generating a first charge pump voltage using a first charge pump;
- providing a switch control signal from an output of a level shifter to an input of a radio frequency switch, the switch control signal generated based on a switch enable signal received by the level shifter;
- powering the level shifter with the first charge pump voltage;
- and
- activating a charge pump assistance switch coupled to the input of the radio frequency switch in response to a transition of the switch enable signal from a first state to a second state.
Dependencies are inferred from the claim text.